Index: include/clang/AST/CanonicalType.h
===================================================================
--- include/clang/AST/CanonicalType.h
+++ include/clang/AST/CanonicalType.h
@@ -510,7 +510,7 @@
   }
 
   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVariadic)
-  LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getTypeQuals)
+  LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Qualifiers, getTypeQuals)
 
   using param_type_iterator =
       CanTypeIterator<FunctionProtoType::param_type_iterator>;
Index: include/clang/AST/DeclCXX.h
===================================================================
--- include/clang/AST/DeclCXX.h
+++ include/clang/AST/DeclCXX.h
@@ -2182,7 +2182,10 @@
   /// 'this' type.
   QualType getThisType(ASTContext &C) const;
 
-  unsigned getTypeQualifiers() const {
+  static QualType getThisType(const FunctionProtoType *FPT,
+                              const CXXRecordDecl *Decl);
+
+  Qualifiers getTypeQualifiers() const {
     return getType()->getAs<FunctionProtoType>()->getTypeQuals();
   }
 
Index: include/clang/AST/Type.h
===================================================================
--- include/clang/AST/Type.h
+++ include/clang/AST/Type.h
@@ -256,28 +256,24 @@
   }
 
   bool hasConst() const { return Mask & Const; }
-  void setConst(bool flag) {
-    Mask = (Mask & ~Const) | (flag ? Const : 0);
-  }
+  bool hasOnlyConst() const { return Mask == Const; }
   void removeConst() { Mask &= ~Const; }
   void addConst() { Mask |= Const; }
 
   bool hasVolatile() const { return Mask & Volatile; }
-  void setVolatile(bool flag) {
-    Mask = (Mask & ~Volatile) | (flag ? Volatile : 0);
-  }
+  bool hasOnlyVolatile() const { return Mask == Volatile; }
   void removeVolatile() { Mask &= ~Volatile; }
   void addVolatile() { Mask |= Volatile; }
 
   bool hasRestrict() const { return Mask & Restrict; }
-  void setRestrict(bool flag) {
-    Mask = (Mask & ~Restrict) | (flag ? Restrict : 0);
-  }
+  bool hasOnlyRestrict() const { return Mask == Restrict; }
   void removeRestrict() { Mask &= ~Restrict; }
   void addRestrict() { Mask |= Restrict; }
 
   bool hasCVRQualifiers() const { return getCVRQualifiers(); }
   unsigned getCVRQualifiers() const { return Mask & CVRMask; }
+  unsigned getCVRUQualifiers() const { return Mask & (CVRMask | UMask); }
+
   void setCVRQualifiers(unsigned mask) {
     assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits");
     Mask = (Mask & ~CVRMask) | mask;
@@ -1526,7 +1522,9 @@
     ///
     /// C++ 8.3.5p4: The return type, the parameter type list and the
     /// cv-qualifier-seq, [...], are part of the function type.
-    unsigned TypeQuals : 4;
+    unsigned CVRTypeQuals : 3;
+    /// Whether this function has extended Qualifiers.
+    unsigned HasExtQuals : 1;
 
     /// The number of parameters this function has, not counting '...'.
     /// According to [implimits] 8 bits should be enough here but this is
@@ -3611,7 +3609,9 @@
     FunctionTypeBits.ExtInfo = Info.Bits;
   }
 
-  unsigned getTypeQuals() const { return FunctionTypeBits.TypeQuals; }
+  Qualifiers getCVRTypeQuals() const {
+    return Qualifiers::fromCVRMask(FunctionTypeBits.CVRTypeQuals);
+  }
 
 public:
   QualType getReturnType() const { return ResultType; }
@@ -3626,9 +3626,10 @@
 
   CallingConv getCallConv() const { return getExtInfo().getCC(); }
   ExtInfo getExtInfo() const { return ExtInfo(FunctionTypeBits.ExtInfo); }
-  bool isConst() const { return getTypeQuals() & Qualifiers::Const; }
-  bool isVolatile() const { return getTypeQuals() & Qualifiers::Volatile; }
-  bool isRestrict() const { return getTypeQuals() & Qualifiers::Restrict; }
+
+  bool isConst() const { return getCVRTypeQuals().hasConst(); }
+  bool isVolatile() const { return getCVRTypeQuals().hasVolatile(); }
+  bool isRestrict() const { return getCVRTypeQuals().hasRestrict(); }
 
   /// Determine the type of an expression that calls a function of
   /// this type.
@@ -3689,7 +3690,7 @@
       private llvm::TrailingObjects<
           FunctionProtoType, QualType, FunctionType::FunctionTypeExtraBitfields,
           FunctionType::ExceptionType, Expr *, FunctionDecl *,
-          FunctionType::ExtParameterInfo> {
+          FunctionType::ExtParameterInfo, Qualifiers> {
   friend class ASTContext; // ASTContext creates these.
   friend TrailingObjects;
 
@@ -3717,6 +3718,10 @@
   //   an ExtParameterInfo for each of the parameters. Present if and
   //   only if hasExtParameterInfos() is true.
   //
+  // * Optionally a Qualifiers object to represent extra qualifiers that can't
+  //   be represented by FunctionTypeBitfields.CVRTypeQuals. Present if and only
+  //   if hasExtQualifiers() is true.
+  //
   // The optional FunctionTypeExtraBitfields has to be before the data
   // related to the exception specification since it contains the number
   // of exception types.
@@ -3763,7 +3768,7 @@
     FunctionType::ExtInfo ExtInfo;
     bool Variadic : 1;
     bool HasTrailingReturn : 1;
-    unsigned char TypeQuals = 0;
+    Qualifiers TypeQuals;
     RefQualifierKind RefQualifier = RQ_None;
     ExceptionSpecInfo ExceptionSpec;
     const ExtParameterInfo *ExtParameterInfos = nullptr;
@@ -3875,6 +3880,10 @@
     return hasExtraBitfields(getExceptionSpecType());
   }
 
+  bool hasExtQualifiers() const {
+    return FunctionTypeBits.HasExtQuals;
+  }
+
 public:
   unsigned getNumParams() const { return FunctionTypeBits.NumParams; }
 
@@ -3893,7 +3902,7 @@
     EPI.Variadic = isVariadic();
     EPI.HasTrailingReturn = hasTrailingReturn();
     EPI.ExceptionSpec.Type = getExceptionSpecType();
-    EPI.TypeQuals = static_cast<unsigned char>(getTypeQuals());
+    EPI.TypeQuals = getTypeQuals();
     EPI.RefQualifier = getRefQualifier();
     if (EPI.ExceptionSpec.Type == EST_Dynamic) {
       EPI.ExceptionSpec.Exceptions = exceptions();
@@ -4003,7 +4012,12 @@
   /// Whether this function prototype has a trailing return type.
   bool hasTrailingReturn() const { return FunctionTypeBits.HasTrailingReturn; }
 
-  unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); }
+  Qualifiers getTypeQuals() const {
+    if (hasExtQualifiers())
+      return *getTrailingObjects<Qualifiers>();
+    else
+      return getCVRTypeQuals();
+  }
 
   /// Retrieve the ref-qualifier associated with this function type.
   RefQualifierKind getRefQualifier() const {
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -5103,7 +5103,7 @@
     /// using the given declaration (which is either a class template or a
     /// class) along with the given qualifiers.
     /// along with the qualifiers placed on '*this'.
-    CXXThisScopeRAII(Sema &S, Decl *ContextDecl, unsigned CXXThisTypeQuals,
+    CXXThisScopeRAII(Sema &S, Decl *ContextDecl, Qualifiers CXXThisTypeQuals,
                      bool Enabled = true);
 
     ~CXXThisScopeRAII();
Index: lib/AST/ASTContext.cpp
===================================================================
--- lib/AST/ASTContext.cpp
+++ lib/AST/ASTContext.cpp
@@ -3768,10 +3768,11 @@
   size_t Size = FunctionProtoType::totalSizeToAlloc<
       QualType, FunctionType::FunctionTypeExtraBitfields,
       FunctionType::ExceptionType, Expr *, FunctionDecl *,
-      FunctionProtoType::ExtParameterInfo>(
+      FunctionProtoType::ExtParameterInfo, Qualifiers>(
       NumArgs, FunctionProtoType::hasExtraBitfields(EPI.ExceptionSpec.Type),
       ESH.NumExceptionType, ESH.NumExprPtr, ESH.NumFunctionDeclPtr,
-      EPI.ExtParameterInfos ? NumArgs : 0);
+      EPI.ExtParameterInfos ? NumArgs : 0,
+      EPI.TypeQuals.hasNonFastQualifiers() ? 1 : 0);
 
   auto *FTP = (FunctionProtoType *)Allocate(Size, TypeAlignment);
   FunctionProtoType::ExtProtoInfo newEPI = EPI;
Index: lib/AST/ASTDumper.cpp
===================================================================
--- lib/AST/ASTDumper.cpp
+++ lib/AST/ASTDumper.cpp
@@ -334,9 +334,10 @@
     void VisitFunctionProtoType(const FunctionProtoType *T) {
       auto EPI = T->getExtProtoInfo();
       if (EPI.HasTrailingReturn) OS << " trailing_return";
-      if (T->isConst()) OS << " const";
-      if (T->isVolatile()) OS << " volatile";
-      if (T->isRestrict()) OS << " restrict";
+
+      if (!T->getTypeQuals().empty())
+        OS << " " << T->getTypeQuals().getAsString();
+
       switch (EPI.RefQualifier) {
         case RQ_None: break;
         case RQ_LValue: OS << " &"; break;
Index: lib/AST/DeclCXX.cpp
===================================================================
--- lib/AST/DeclCXX.cpp
+++ lib/AST/DeclCXX.cpp
@@ -2173,19 +2173,23 @@
   return getASTContext().overridden_methods(this);
 }
 
+QualType CXXMethodDecl::getThisType(const FunctionProtoType *FPT,
+                                    const CXXRecordDecl *Decl) {
+  ASTContext &C = Decl->getASTContext();
+  QualType ClassTy = C.getTypeDeclType(Decl);
+  ClassTy = C.getQualifiedType(ClassTy, FPT->getTypeQuals());
+  return C.getPointerType(ClassTy);
+}
+
 QualType CXXMethodDecl::getThisType(ASTContext &C) const {
   // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
   // If the member function is declared const, the type of this is const X*,
   // if the member function is declared volatile, the type of this is
   // volatile X*, and if the member function is declared const volatile,
   // the type of this is const volatile X*.
-
   assert(isInstance() && "No 'this' for static methods!");
-
-  QualType ClassTy = C.getTypeDeclType(getParent());
-  ClassTy = C.getQualifiedType(ClassTy,
-                               Qualifiers::fromCVRUMask(getTypeQualifiers()));
-  return C.getPointerType(ClassTy);
+  return CXXMethodDecl::getThisType(getType()->getAs<FunctionProtoType>(),
+                                    getParent());
 }
 
 bool CXXMethodDecl::hasInlineBody() const {
Index: lib/AST/ItaniumMangle.cpp
===================================================================
--- lib/AST/ItaniumMangle.cpp
+++ lib/AST/ItaniumMangle.cpp
@@ -1503,8 +1503,7 @@
 
   Out << 'N';
   if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(ND)) {
-    Qualifiers MethodQuals =
-        Qualifiers::fromCVRUMask(Method->getTypeQualifiers());
+    Qualifiers MethodQuals = Method->getTypeQualifiers();
     // We do not consider restrict a distinguishing attribute for overloading
     // purposes so we must not mangle it.
     MethodQuals.removeRestrict();
@@ -2724,7 +2723,7 @@
 
   // Mangle CV-qualifiers, if present.  These are 'this' qualifiers,
   // e.g. "const" in "int (A::*)() const".
-  mangleQualifiers(Qualifiers::fromCVRUMask(T->getTypeQuals()));
+  mangleQualifiers(T->getTypeQuals());
 
   // Mangle instantiation-dependent exception-specification, if present,
   // per cxx-abi-dev proposal on 2016-10-11.
Index: lib/AST/MicrosoftMangle.cpp
===================================================================
--- lib/AST/MicrosoftMangle.cpp
+++ lib/AST/MicrosoftMangle.cpp
@@ -2093,7 +2093,7 @@
   // If this is a C++ instance method, mangle the CVR qualifiers for the
   // this pointer.
   if (HasThisQuals) {
-    Qualifiers Quals = Qualifiers::fromCVRUMask(Proto->getTypeQuals());
+    Qualifiers Quals = Proto->getTypeQuals();
     manglePointerExtQualifiers(Quals, /*PointeeType=*/QualType());
     mangleRefQualifier(Proto->getRefQualifier());
     mangleQualifiers(Quals, /*IsMember=*/false);
Index: lib/AST/Type.cpp
===================================================================
--- lib/AST/Type.cpp
+++ lib/AST/Type.cpp
@@ -2842,7 +2842,7 @@
                    result->isInstantiationDependentType(),
                    result->isVariablyModifiedType(),
                    result->containsUnexpandedParameterPack(), epi.ExtInfo) {
-  FunctionTypeBits.TypeQuals = epi.TypeQuals;
+  FunctionTypeBits.CVRTypeQuals = epi.TypeQuals.getCVRQualifiers();
   FunctionTypeBits.RefQualifier = epi.RefQualifier;
   FunctionTypeBits.NumParams = params.size();
   assert(getNumParams() == params.size() && "NumParams overflow!");
@@ -2941,6 +2941,13 @@
     for (unsigned i = 0; i != getNumParams(); ++i)
       extParamInfos[i] = epi.ExtParameterInfos[i];
   }
+
+  if (epi.TypeQuals.hasNonFastQualifiers()) {
+   FunctionTypeBits.HasExtQuals = 1;
+   *getTrailingObjects<Qualifiers>() = epi.TypeQuals;
+  } else {
+   FunctionTypeBits.HasExtQuals = 0;
+  }
 }
 
 bool FunctionProtoType::hasDependentExceptionSpec() const {
@@ -3032,14 +3039,13 @@
   // shortcut, use one AddInteger call instead of four for the next four
   // fields.
   assert(!(unsigned(epi.Variadic) & ~1) &&
-         !(unsigned(epi.TypeQuals) & ~255) &&
          !(unsigned(epi.RefQualifier) & ~3) &&
          !(unsigned(epi.ExceptionSpec.Type) & ~15) &&
          "Values larger than expected.");
   ID.AddInteger(unsigned(epi.Variadic) +
-                (epi.TypeQuals << 1) +
-                (epi.RefQualifier << 9) +
-                (epi.ExceptionSpec.Type << 11));
+                (epi.RefQualifier << 1) +
+                (epi.ExceptionSpec.Type << 3));
+  ID.Add(epi.TypeQuals);
   if (epi.ExceptionSpec.Type == EST_Dynamic) {
     for (QualType Ex : epi.ExceptionSpec.Exceptions)
       ID.AddPointer(Ex.getAsOpaquePtr());
Index: lib/AST/TypePrinter.cpp
===================================================================
--- lib/AST/TypePrinter.cpp
+++ lib/AST/TypePrinter.cpp
@@ -801,10 +801,8 @@
 
   printFunctionAfter(Info, OS);
 
-  if (unsigned quals = T->getTypeQuals()) {
-    OS << ' ';
-    AppendTypeQualList(OS, quals, Policy.Restrict);
-  }
+  if (!T->getTypeQuals().empty())
+    OS << " " << T->getTypeQuals().getAsString();
 
   switch (T->getRefQualifier()) {
   case RQ_None:
Index: lib/CodeGen/CGCall.cpp
===================================================================
--- lib/CodeGen/CGCall.cpp
+++ lib/CodeGen/CGCall.cpp
@@ -67,11 +67,13 @@
   }
 }
 
-/// Derives the 'this' type for codegen purposes, i.e. ignoring method
+/// Derives the 'this' type for codegen purposes, i.e. ignoring method CVR
 /// qualification.
-/// FIXME: address space qualification?
-static CanQualType GetThisType(ASTContext &Context, const CXXRecordDecl *RD) {
+static CanQualType GetThisType(ASTContext &Context, const CXXRecordDecl *RD,
+                               const CXXMethodDecl *MD) {
   QualType RecTy = Context.getTagDeclType(RD)->getCanonicalTypeInternal();
+  if (MD)
+    RecTy = Context.getAddrSpaceQualType(RecTy, MD->getType().getAddressSpace());
   return Context.getPointerType(CanQualType::CreateUnsafe(RecTy));
 }
 
@@ -246,7 +248,7 @@
 
   // Add the 'this' pointer.
   if (RD)
-    argTypes.push_back(GetThisType(Context, RD));
+    argTypes.push_back(GetThisType(Context, RD, MD));
   else
     argTypes.push_back(Context.VoidPtrTy);
 
@@ -302,7 +304,7 @@
 
   SmallVector<CanQualType, 16> argTypes;
   SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
-  argTypes.push_back(GetThisType(Context, MD->getParent()));
+  argTypes.push_back(GetThisType(Context, MD->getParent(), MD));
 
   bool PassParams = true;
 
@@ -529,7 +531,7 @@
 CodeGenTypes::arrangeUnprototypedMustTailThunk(const CXXMethodDecl *MD) {
   assert(MD->isVirtual() && "only methods have thunks");
   CanQual<FunctionProtoType> FTP = GetFormalType(MD);
-  CanQualType ArgTys[] = { GetThisType(Context, MD->getParent()) };
+  CanQualType ArgTys[] = { GetThisType(Context, MD->getParent(), MD) };
   return arrangeLLVMFunctionInfo(Context.VoidTy, /*instanceMethod=*/false,
                                  /*chainCall=*/false, ArgTys,
                                  FTP->getExtInfo(), {}, RequiredArgs(1));
@@ -543,7 +545,7 @@
   CanQual<FunctionProtoType> FTP = GetFormalType(CD);
   SmallVector<CanQualType, 2> ArgTys;
   const CXXRecordDecl *RD = CD->getParent();
-  ArgTys.push_back(GetThisType(Context, RD));
+  ArgTys.push_back(GetThisType(Context, RD, CD));
   if (CT == Ctor_CopyingClosure)
     ArgTys.push_back(*FTP->param_type_begin());
   if (RD->getNumVBases() > 0)
Index: lib/CodeGen/CGClass.cpp
===================================================================
--- lib/CodeGen/CGClass.cpp
+++ lib/CodeGen/CGClass.cpp
@@ -16,6 +16,7 @@
 #include "CGDebugInfo.h"
 #include "CGRecordLayout.h"
 #include "CodeGenFunction.h"
+#include "TargetInfo.h"
 #include "clang/AST/CXXInheritance.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/EvaluatedExprVisitor.h"
@@ -2012,8 +2013,19 @@
                                              bool NewPointerIsChecked) {
   CallArgList Args;
 
+  LangAS SlotAS = E->getType().getAddressSpace();
+  QualType ThisType = D->getThisType(getContext());
+  LangAS ThisAS = ThisType.getTypePtr()->getPointeeType().getAddressSpace();
+  llvm::Value *ThisPtr = This.getPointer();
+  if (SlotAS != ThisAS) {
+    unsigned TargetThisAS = getContext().getTargetAddressSpace(ThisAS);
+    llvm::Type *NewType =
+        ThisPtr->getType()->getPointerElementType()->getPointerTo(TargetThisAS);
+    ThisPtr = getTargetHooks().performAddrSpaceCast(*this, This.getPointer(),
+                                                    ThisAS, SlotAS, NewType);
+  }
   // Push the this ptr.
-  Args.add(RValue::get(This.getPointer()), D->getThisType(getContext()));
+  Args.add(RValue::get(ThisPtr), D->getThisType(getContext()));
 
   // If this is a trivial constructor, emit a memcpy now before we lose
   // the alignment information on the argument.
Index: lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- lib/CodeGen/CGDebugInfo.cpp
+++ lib/CodeGen/CGDebugInfo.cpp
@@ -2589,9 +2589,9 @@
   const FunctionProtoType *FPT =
       Ty->getPointeeType()->getAs<FunctionProtoType>();
   return DBuilder.createMemberPointerType(
-      getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
-                                        Ty->getClass(), FPT->getTypeQuals())),
-                                    FPT, U),
+      getOrCreateInstanceMethodType(
+          CXXMethodDecl::getThisType(FPT, Ty->getMostRecentCXXRecordDecl()),
+          FPT, U),
       ClassType, Size, /*Align=*/0, Flags);
 }
 
Index: lib/CodeGen/CGDeclCXX.cpp
===================================================================
--- lib/CodeGen/CGDeclCXX.cpp
+++ lib/CodeGen/CGDeclCXX.cpp
@@ -26,7 +26,10 @@
 
 static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
                          ConstantAddress DeclPtr) {
-  assert(D.hasGlobalStorage() && "VarDecl must have global storage!");
+  assert(
+      (D.hasGlobalStorage() ||
+       (D.hasLocalStorage() && CGF.getContext().getLangOpts().OpenCLCPlusPlus)) &&
+      "VarDecl must have global or local (in the case of OpenCL) storage!");
   assert(!D.getType()->isReferenceType() &&
          "Should not call EmitDeclInit on a reference!");
 
Index: lib/CodeGen/CGExpr.cpp
===================================================================
--- lib/CodeGen/CGExpr.cpp
+++ lib/CodeGen/CGExpr.cpp
@@ -3943,7 +3943,7 @@
       LValue RefLVal = MakeAddrLValue(addr, FieldType, FieldBaseInfo,
                                       FieldTBAAInfo);
       if (RecordCVR & Qualifiers::Volatile)
-        RefLVal.getQuals().setVolatile(true);
+        RefLVal.getQuals().addVolatile();
       addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
 
       // Qualifiers on the struct don't apply to the referencee.
Index: lib/CodeGen/CGValue.h
===================================================================
--- lib/CodeGen/CGValue.h
+++ lib/CodeGen/CGValue.h
@@ -562,7 +562,10 @@
   }
 
   void setVolatile(bool flag) {
-    Quals.setVolatile(flag);
+    if (flag)
+      Quals.addVolatile();
+    else
+      Quals.removeVolatile();
   }
 
   Qualifiers::ObjCLifetime getObjCLifetime() const {
Index: lib/Index/USRGeneration.cpp
===================================================================
--- lib/Index/USRGeneration.cpp
+++ lib/Index/USRGeneration.cpp
@@ -270,7 +270,7 @@
   if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
     if (MD->isStatic())
       Out << 'S';
-    if (unsigned quals = MD->getTypeQualifiers())
+    if (unsigned quals = MD->getTypeQualifiers().getCVRUQualifiers())
       Out << (char)('0' + quals);
     switch (MD->getRefQualifier()) {
     case RQ_None: break;
Index: lib/Parse/ParseCXXInlineMethods.cpp
===================================================================
--- lib/Parse/ParseCXXInlineMethods.cpp
+++ lib/Parse/ParseCXXInlineMethods.cpp
@@ -595,7 +595,7 @@
     //  to X" within the optional brace-or-equal-initializer. It shall not
     //  appear elsewhere in the member-declarator.
     Sema::CXXThisScopeRAII ThisScope(Actions, Class.TagOrTemplate,
-                                     /*TypeQuals=*/(unsigned)0);
+                                     Qualifiers());
 
     for (size_t i = 0; i < Class.LateParsedDeclarations.size(); ++i) {
       Class.LateParsedDeclarations[i]->ParseLexedMemberInitializers();
Index: lib/Parse/ParseDecl.cpp
===================================================================
--- lib/Parse/ParseDecl.cpp
+++ lib/Parse/ParseDecl.cpp
@@ -1427,7 +1427,7 @@
     RecordDecl *RD = dyn_cast_or_null<RecordDecl>(D->getDeclContext());
 
     // Allow 'this' within late-parsed attributes.
-    Sema::CXXThisScopeRAII ThisScope(Actions, RD, /*TypeQuals=*/0,
+    Sema::CXXThisScopeRAII ThisScope(Actions, RD, Qualifiers(),
                                      ND && ND->isCXXInstanceMember());
 
     if (LA.Decls.size() == 1) {
@@ -6162,13 +6162,14 @@
          : D.getContext() == DeclaratorContext::FileContext &&
            D.getCXXScopeSpec().isValid() &&
            Actions.CurContext->isRecord());
-      Sema::CXXThisScopeRAII ThisScope(Actions,
-                               dyn_cast<CXXRecordDecl>(Actions.CurContext),
-                               DS.getTypeQualifiers() |
-                               (D.getDeclSpec().isConstexprSpecified() &&
-                                !getLangOpts().CPlusPlus14
-                                  ? Qualifiers::Const : 0),
-                               IsCXX11MemberFunction);
+
+      Qualifiers Q = Qualifiers::fromOpaqueValue(DS.getTypeQualifiers());
+      if (D.getDeclSpec().isConstexprSpecified() && !getLangOpts().CPlusPlus14)
+        Q.addConst();
+
+      Sema::CXXThisScopeRAII ThisScope(
+          Actions, dyn_cast<CXXRecordDecl>(Actions.CurContext), Q,
+          IsCXX11MemberFunction);
 
       // Parse exception-specification[opt].
       bool Delayed = D.isFirstDeclarationOfMember() &&
Index: lib/Parse/ParseOpenMP.cpp
===================================================================
--- lib/Parse/ParseOpenMP.cpp
+++ lib/Parse/ParseOpenMP.cpp
@@ -495,7 +495,7 @@
     Sema &Actions = P.getActions();
 
     // Allow 'this' within late-parsed attributes.
-    ThisScope = new Sema::CXXThisScopeRAII(Actions, RD, /*TypeQuals=*/0,
+    ThisScope = new Sema::CXXThisScopeRAII(Actions, RD, Qualifiers(),
                                            ND && ND->isCXXInstanceMember());
 
     // If the Decl is templatized, add template parameters to scope.
Index: lib/Sema/SemaCodeComplete.cpp
===================================================================
--- lib/Sema/SemaCodeComplete.cpp
+++ lib/Sema/SemaCodeComplete.cpp
@@ -1042,8 +1042,7 @@
   if (HasObjectTypeQualifiers)
     if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(R.Declaration))
       if (Method->isInstance()) {
-        Qualifiers MethodQuals
-                        = Qualifiers::fromCVRMask(Method->getTypeQualifiers());
+        Qualifiers MethodQuals = Method->getTypeQualifiers();
         if (ObjectTypeQualifiers == MethodQuals)
           R.Priority += CCD_ObjectQualifierMatch;
         else if (ObjectTypeQualifiers - MethodQuals) {
@@ -2733,17 +2732,17 @@
   // FIXME: Add ref-qualifier!
 
   // Handle single qualifiers without copying
-  if (Proto->getTypeQuals() == Qualifiers::Const) {
+  if (Proto->getTypeQuals().hasOnlyConst()) {
     Result.AddInformativeChunk(" const");
     return;
   }
 
-  if (Proto->getTypeQuals() == Qualifiers::Volatile) {
+  if (Proto->getTypeQuals().hasOnlyVolatile()) {
     Result.AddInformativeChunk(" volatile");
     return;
   }
 
-  if (Proto->getTypeQuals() == Qualifiers::Restrict) {
+  if (Proto->getTypeQuals().hasOnlyRestrict()) {
     Result.AddInformativeChunk(" restrict");
     return;
   }
@@ -3697,8 +3696,7 @@
   RecordDecl *MemberCompletionRecord = nullptr;
   if (CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext)) {
     if (CurMethod->isInstance()) {
-      Results.setObjectTypeQualifiers(
-                      Qualifiers::fromCVRMask(CurMethod->getTypeQualifiers()));
+      Results.setObjectTypeQualifiers(CurMethod->getTypeQualifiers());
       MemberCompletionRecord = CurMethod->getParent();
     }
   }
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -9986,7 +9986,7 @@
   CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
   if (!getLangOpts().CPlusPlus14 && MD && MD->isConstexpr() &&
       !MD->isStatic() && !isa<CXXConstructorDecl>(MD) &&
-      (MD->getTypeQualifiers() & Qualifiers::Const) == 0) {
+      !MD->getTypeQualifiers().hasConst()) {
     CXXMethodDecl *OldMD = nullptr;
     if (OldDecl)
       OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());
@@ -9994,7 +9994,7 @@
       const FunctionProtoType *FPT =
         MD->getType()->castAs<FunctionProtoType>();
       FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
-      EPI.TypeQuals |= Qualifiers::Const;
+      EPI.TypeQuals.addConst();
       MD->setType(Context.getFunctionType(FPT->getReturnType(),
                                           FPT->getParamTypes(), EPI));
 
Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -8165,7 +8165,7 @@
     return R;
 
   FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
-  EPI.TypeQuals = 0;
+  EPI.TypeQuals = Qualifiers();
   EPI.RefQualifier = RQ_None;
 
   return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI);
@@ -8371,7 +8371,7 @@
   const FunctionProtoType *Proto = R->getAs<FunctionProtoType>();
   FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
   EPI.Variadic = false;
-  EPI.TypeQuals = 0;
+  EPI.TypeQuals = Qualifiers();
   EPI.RefQualifier = RQ_None;
   return Context.getFunctionType(Context.VoidTy, None, EPI);
 }
@@ -11957,7 +11957,7 @@
     // Dereference "this".
     DerefBuilder DerefThis(This);
     CastBuilder To(DerefThis,
-                   Context.getCVRQualifiedType(
+                   Context.getQualifiedType(
                        BaseType, CopyAssignOperator->getTypeQualifiers()),
                    VK_LValue, BasePath);
 
@@ -12324,7 +12324,7 @@
 
     // Implicitly cast "this" to the appropriately-qualified base type.
     CastBuilder To(DerefThis,
-                   Context.getCVRQualifiedType(
+                   Context.getQualifiedType(
                        BaseType, MoveAssignOperator->getTypeQualifiers()),
                    VK_LValue, BasePath);
 
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -13426,7 +13426,7 @@
     // Drop the parameters.
     FunctionProtoType::ExtProtoInfo EPI;
     EPI.HasTrailingReturn = false;
-    EPI.TypeQuals |= DeclSpec::TQ_const;
+    EPI.TypeQuals.addConst();
     T = Context.getFunctionType(Context.DependentTy, None, EPI);
     Sig = Context.getTrivialTypeSourceInfo(T);
   }
@@ -13602,7 +13602,7 @@
     } else {
       const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
       FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
-      EPI.TypeQuals = 0; // FIXME: silently?
+      EPI.TypeQuals = Qualifiers();
       EPI.ExtInfo = Ext;
       BlockTy = Context.getFunctionType(RetTy, FPT->getParamTypes(), EPI);
     }
Index: lib/Sema/SemaExprCXX.cpp
===================================================================
--- lib/Sema/SemaExprCXX.cpp
+++ lib/Sema/SemaExprCXX.cpp
@@ -1094,7 +1094,7 @@
 
 Sema::CXXThisScopeRAII::CXXThisScopeRAII(Sema &S,
                                          Decl *ContextDecl,
-                                         unsigned CXXThisTypeQuals,
+                                         Qualifiers CXXThisTypeQuals,
                                          bool Enabled)
   : S(S), OldCXXThisTypeOverride(S.CXXThisTypeOverride), Enabled(false)
 {
@@ -1107,11 +1107,11 @@
   else
     Record = cast<CXXRecordDecl>(ContextDecl);
 
-  // We care only for CVR qualifiers here, so cut everything else.
-  CXXThisTypeQuals &= Qualifiers::FastMask;
-  S.CXXThisTypeOverride
-    = S.Context.getPointerType(
-        S.Context.getRecordType(Record).withCVRQualifiers(CXXThisTypeQuals));
+  unsigned Quals = CXXThisTypeQuals.getCVRQualifiers();
+  QualType T = S.Context.getRecordType(Record).withCVRQualifiers(Quals);
+  T = S.getASTContext().getAddrSpaceQualType(T, CXXThisTypeQuals.getAddressSpace());
+
+  S.CXXThisTypeOverride = S.Context.getPointerType(T);
 
   this->Enabled = true;
 }
Index: lib/Sema/SemaLambda.cpp
===================================================================
--- lib/Sema/SemaLambda.cpp
+++ lib/Sema/SemaLambda.cpp
@@ -859,7 +859,7 @@
     FunctionProtoType::ExtProtoInfo EPI(Context.getDefaultCallingConvention(
         /*IsVariadic=*/false, /*IsCXXMethod=*/true));
     EPI.HasTrailingReturn = true;
-    EPI.TypeQuals |= DeclSpec::TQ_const;
+    EPI.TypeQuals.addConst();
     // C++1y [expr.prim.lambda]:
     //   The lambda return type is 'auto', which is replaced by the
     //   trailing-return type if provided and/or deduced from 'return'
@@ -1198,7 +1198,7 @@
   CallingConv CC = Context.getDefaultCallingConvention(
       CallOpProto->isVariadic(), /*IsCXXMethod=*/false);
   InvokerExtInfo.ExtInfo = InvokerExtInfo.ExtInfo.withCallingConv(CC);
-  InvokerExtInfo.TypeQuals = 0;
+  InvokerExtInfo.TypeQuals = Qualifiers();
   assert(InvokerExtInfo.RefQualifier == RQ_None &&
       "Lambda's call operator should not have a reference qualifier");
   return Context.getFunctionType(CallOpProto->getReturnType(),
@@ -1229,7 +1229,8 @@
       S.Context.getDefaultCallingConvention(
       /*IsVariadic=*/false, /*IsCXXMethod=*/true));
   // The conversion function is always const.
-  ConvExtInfo.TypeQuals = Qualifiers::Const;
+  ConvExtInfo.TypeQuals = Qualifiers();
+  ConvExtInfo.TypeQuals.addConst();
   QualType ConvTy =
       S.Context.getFunctionType(PtrToFunctionTy, None, ConvExtInfo);
 
@@ -1377,7 +1378,8 @@
   FunctionProtoType::ExtProtoInfo ConversionEPI(
       S.Context.getDefaultCallingConvention(
           /*IsVariadic=*/false, /*IsCXXMethod=*/true));
-  ConversionEPI.TypeQuals = Qualifiers::Const;
+  ConversionEPI.TypeQuals = Qualifiers();
+  ConversionEPI.TypeQuals.addConst();
   QualType ConvTy = S.Context.getFunctionType(BlockPtrTy, None, ConversionEPI);
 
   SourceLocation Loc = IntroducerRange.getBegin();
Index: lib/Sema/SemaOverload.cpp
===================================================================
--- lib/Sema/SemaOverload.cpp
+++ lib/Sema/SemaOverload.cpp
@@ -1142,8 +1142,8 @@
     // function yet (because we haven't yet resolved whether this is a static
     // or non-static member function). Add it now, on the assumption that this
     // is a redeclaration of OldMethod.
-    unsigned OldQuals = OldMethod->getTypeQualifiers();
-    unsigned NewQuals = NewMethod->getTypeQualifiers();
+    unsigned OldQuals = OldMethod->getTypeQualifiers().getCVRUQualifiers();
+    unsigned NewQuals = NewMethod->getTypeQualifiers().getCVRUQualifiers();
     if (!getLangOpts().CPlusPlus14 && NewMethod->isConstexpr() &&
         !isa<CXXConstructorDecl>(NewMethod))
       NewQuals |= Qualifiers::Const;
@@ -2823,8 +2823,8 @@
     return;
   }
 
-  unsigned FromQuals = FromFunction->getTypeQuals(),
-           ToQuals = ToFunction->getTypeQuals();
+  unsigned FromQuals = FromFunction->getTypeQuals().getCVRUQualifiers();
+  unsigned ToQuals = ToFunction->getTypeQuals().getCVRUQualifiers();
   if (FromQuals != ToQuals) {
     PDiag << ft_qualifer_mismatch << ToQuals << FromQuals;
     return;
@@ -5065,9 +5065,15 @@
   QualType ClassType = S.Context.getTypeDeclType(ActingContext);
   // [class.dtor]p2: A destructor can be invoked for a const, volatile or
   //                 const volatile object.
-  unsigned Quals = isa<CXXDestructorDecl>(Method) ?
-    Qualifiers::Const | Qualifiers::Volatile : Method->getTypeQualifiers();
-  QualType ImplicitParamType =  S.Context.getCVRQualifiedType(ClassType, Quals);
+  Qualifiers Quals;
+  if (isa<CXXDestructorDecl>(Method)) {
+    Quals.addConst();
+    Quals.addVolatile();
+  } else {
+    Quals = Method->getTypeQualifiers();
+  }
+
+  QualType ImplicitParamType = S.Context.getQualifiedType(ClassType, Quals);
 
   // Set up the conversion sequence as a "bad" conversion, to allow us
   // to exit early.
@@ -5133,7 +5139,7 @@
     break;
 
   case RQ_LValue:
-    if (!FromClassification.isLValue() && Quals != Qualifiers::Const) {
+    if (!FromClassification.isLValue() && !Quals.hasOnlyConst()) {
       // non-const lvalue reference cannot bind to an rvalue
       ICS.setBad(BadConversionSequence::lvalue_ref_to_rvalue, FromType,
                  ImplicitParamType);
@@ -5249,9 +5255,14 @@
     From = FromRes.get();
   }
 
-  if (!Context.hasSameType(From->getType(), DestType))
-    From = ImpCastExprToType(From, DestType, CK_NoOp,
+  if (!Context.hasSameType(From->getType(), DestType)) {
+    if (From->getType().getAddressSpace() != DestType.getAddressSpace())
+      From = ImpCastExprToType(From, DestType, CK_AddressSpaceConversion,
                              From->getValueKind()).get();
+    else
+      From = ImpCastExprToType(From, DestType, CK_NoOp,
+                             From->getValueKind()).get();
+  }
   return From;
 }
 
@@ -12816,7 +12827,7 @@
 
     // Check that the object type isn't more qualified than the
     // member function we're calling.
-    Qualifiers funcQuals = Qualifiers::fromCVRMask(proto->getTypeQuals());
+    Qualifiers funcQuals = proto->getTypeQuals();
 
     QualType objectType = op->getLHS()->getType();
     if (op->getOpcode() == BO_PtrMemI)
Index: lib/Sema/SemaTemplate.cpp
===================================================================
--- lib/Sema/SemaTemplate.cpp
+++ lib/Sema/SemaTemplate.cpp
@@ -8107,7 +8107,7 @@
         if (OldMD && OldMD->isConst()) {
           const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>();
           FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
-          EPI.TypeQuals |= Qualifiers::Const;
+          EPI.TypeQuals.addConst();
           FT = Context.getFunctionType(FPT->getReturnType(),
                                        FPT->getParamTypes(), EPI);
         }
Index: lib/Sema/SemaTemplateDeduction.cpp
===================================================================
--- lib/Sema/SemaTemplateDeduction.cpp
+++ lib/Sema/SemaTemplateDeduction.cpp
@@ -3076,7 +3076,7 @@
     //   "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
     //   and the end of the function-definition, member-declarator, or
     //   declarator.
-    unsigned ThisTypeQuals = 0;
+    Qualifiers ThisTypeQuals;
     CXXRecordDecl *ThisContext = nullptr;
     if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Function)) {
       ThisContext = Method->getParent();
@@ -4655,8 +4655,7 @@
   // The standard doesn't say explicitly, but we pick the appropriate kind of
   // reference type based on [over.match.funcs]p4.
   QualType ArgTy = Context.getTypeDeclType(Method->getParent());
-  ArgTy = Context.getQualifiedType(ArgTy,
-                        Qualifiers::fromCVRMask(Method->getTypeQualifiers()));
+  ArgTy = Context.getQualifiedType(ArgTy, Method->getTypeQualifiers());
   if (Method->getRefQualifier() == RQ_RValue)
     ArgTy = Context.getRValueReferenceType(ArgTy);
   else
Index: lib/Sema/SemaTemplateInstantiate.cpp
===================================================================
--- lib/Sema/SemaTemplateInstantiate.cpp
+++ lib/Sema/SemaTemplateInstantiate.cpp
@@ -2148,7 +2148,7 @@
     NamedDecl *ND = dyn_cast<NamedDecl>(I->NewDecl);
     CXXRecordDecl *ThisContext =
         dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
-    CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0,
+    CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(),
                                ND && ND->isCXXInstanceMember());
 
     Attr *NewAttr =
@@ -2343,7 +2343,7 @@
 
   // Instantiate the initializer.
   ActOnStartCXXInClassMemberInitializer();
-  CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), /*TypeQuals=*/0);
+  CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), Qualifiers());
 
   ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs,
                                         /*CXXDirectInit=*/false);
Index: lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -295,7 +295,7 @@
               PVD, FD->getParamDecl(PVD->getFunctionScopeIndex()));
         return S.SubstExpr(E, TemplateArgs);
       }
-    Sema::CXXThisScopeRAII ThisScope(S, ThisContext, /*TypeQuals=*/0,
+    Sema::CXXThisScopeRAII ThisScope(S, ThisContext, Qualifiers(),
                                      FD->isCXXInstanceMember());
     return S.SubstExpr(E, TemplateArgs);
   };
@@ -355,7 +355,7 @@
       // applicable to template declaration, we'll need to add them here.
       CXXThisScopeRAII ThisScope(
           *this, dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext()),
-          /*TypeQuals*/ 0, ND->isCXXInstanceMember());
+          Qualifiers(), ND->isCXXInstanceMember());
 
       Attr *NewAttr = sema::instantiateTemplateAttributeForDecl(
           TmplAttr, Context, *this, TemplateArgs);
@@ -459,7 +459,7 @@
       NamedDecl *ND = dyn_cast<NamedDecl>(New);
       CXXRecordDecl *ThisContext =
           dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
-      CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0,
+      CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(),
                                  ND && ND->isCXXInstanceMember());
 
       Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context,
@@ -2803,7 +2803,7 @@
         cast<DeclRefExpr>(D->getCombinerOut())->getDecl(),
         cast<DeclRefExpr>(NewDRD->getCombinerOut())->getDecl());
     auto *ThisContext = dyn_cast_or_null<CXXRecordDecl>(Owner);
-    Sema::CXXThisScopeRAII ThisScope(SemaRef, ThisContext, /*TypeQuals*/ 0,
+    Sema::CXXThisScopeRAII ThisScope(SemaRef, ThisContext, Qualifiers(),
                                      ThisContext);
     SubstCombiner = SemaRef.SubstExpr(D->getCombiner(), TemplateArgs).get();
     SemaRef.ActOnOpenMPDeclareReductionCombinerEnd(NewDRD, SubstCombiner);
@@ -3425,7 +3425,7 @@
   unsigned ThisTypeQuals = 0;
   if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
     ThisContext = cast<CXXRecordDecl>(Owner);
-    ThisTypeQuals = Method->getTypeQualifiers();
+    ThisTypeQuals = Method->getTypeQualifiers().getCVRQualifiers();
   }
 
   TypeSourceInfo *NewTInfo
Index: lib/Sema/SemaType.cpp
===================================================================
--- lib/Sema/SemaType.cpp
+++ lib/Sema/SemaType.cpp
@@ -1864,8 +1864,7 @@
 }
 
 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
-  std::string Quals =
-    Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString();
+  std::string Quals = FnTy->getTypeQuals().getAsString();
 
   switch (FnTy->getRefQualifier()) {
   case RQ_None:
@@ -1907,7 +1906,7 @@
                                    QualifiedFunctionKind QFK) {
   // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
   const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
-  if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None))
+  if (!FPT || (FPT->getTypeQuals().empty() && FPT->getRefQualifier() == RQ_None))
     return false;
 
   S.Diag(Loc, diag::err_compound_qualified_function_type)
@@ -3940,7 +3939,7 @@
 
   // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
   bool IsQualifiedFunction = T->isFunctionProtoType() &&
-      (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 ||
+      (!T->castAs<FunctionProtoType>()->getTypeQuals().empty() ||
        T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
 
   // If T is 'decltype(auto)', the only declarators we can have are parens
@@ -4686,7 +4685,7 @@
         EPI.ExtInfo = EI;
         EPI.Variadic = FTI.isVariadic;
         EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
-        EPI.TypeQuals = FTI.TypeQuals;
+        EPI.TypeQuals.addCVRUQualifiers(FTI.TypeQuals);
         EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
                     : FTI.RefQualifierIsLValueRef? RQ_LValue
                     : RQ_RValue;
@@ -4813,7 +4812,21 @@
                                       Exceptions,
                                       EPI.ExceptionSpec);
 
-        T = Context.getFunctionType(T, ParamTys, EPI);
+        // OpenCLCPlusPlus: A class member function has an address space.
+        if (state.getSema().getLangOpts().OpenCLCPlusPlus &&
+            state.getDeclarator().getContext() ==
+                DeclaratorContext::MemberContext) {
+          LangAS CurAS = EPI.TypeQuals.getAddressSpace();
+          // If a class member function's address space is not set, set it to
+          // __generic.
+          LangAS AS =
+              (CurAS == LangAS::Default ? LangAS::opencl_generic : CurAS);
+          EPI.TypeQuals.addAddressSpace(AS);
+          T = Context.getFunctionType(T, ParamTys, EPI);
+          T = state.getSema().Context.getAddrSpaceQualType(T, AS);
+        } else {
+          T = Context.getFunctionType(T, ParamTys, EPI);
+        }
       }
       break;
     }
@@ -5004,7 +5017,7 @@
 
       // Strip the cv-qualifiers and ref-qualifiers from the type.
       FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
-      EPI.TypeQuals = 0;
+      EPI.TypeQuals.removeCVRQualifiers();
       EPI.RefQualifier = RQ_None;
 
       T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
Index: lib/Sema/TreeTransform.h
===================================================================
--- lib/Sema/TreeTransform.h
+++ lib/Sema/TreeTransform.h
@@ -5272,7 +5272,8 @@
       //   "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
       //   and the end of the function-definition, member-declarator, or
       //   declarator.
-      Sema::CXXThisScopeRAII ThisScope(SemaRef, ThisContext, ThisTypeQuals);
+      Sema::CXXThisScopeRAII ThisScope(
+          SemaRef, ThisContext, Qualifiers::fromOpaqueValue(ThisTypeQuals));
 
       ResultType = getDerived().TransformType(TLB, TL.getReturnLoc());
       if (ResultType.isNull())
Index: lib/Serialization/ASTReader.cpp
===================================================================
--- lib/Serialization/ASTReader.cpp
+++ lib/Serialization/ASTReader.cpp
@@ -6051,7 +6051,7 @@
 
     EPI.Variadic = Record[Idx++];
     EPI.HasTrailingReturn = Record[Idx++];
-    EPI.TypeQuals = Record[Idx++];
+    EPI.TypeQuals = Qualifiers::fromOpaqueValue(Record[Idx++]);
     EPI.RefQualifier = static_cast<RefQualifierKind>(Record[Idx++]);
     SmallVector<QualType, 8> ExceptionStorage;
     readExceptionSpec(*Loc.F, ExceptionStorage, EPI.ExceptionSpec, Record, Idx);
Index: lib/Serialization/ASTWriter.cpp
===================================================================
--- lib/Serialization/ASTWriter.cpp
+++ lib/Serialization/ASTWriter.cpp
@@ -310,7 +310,7 @@
 
   Record.push_back(T->isVariadic());
   Record.push_back(T->hasTrailingReturn());
-  Record.push_back(T->getTypeQuals());
+  Record.push_back(T->getTypeQuals().getAsOpaqueValue());
   Record.push_back(static_cast<unsigned>(T->getRefQualifier()));
   addExceptionSpec(T, Record);
 
Index: test/CodeGenOpenCLCXX/addrspace-of-this.cl
===================================================================
--- /dev/null
+++ test/CodeGenOpenCLCXX/addrspace-of-this.cl
@@ -0,0 +1,129 @@
+// RUN: %clang_cc1 %s -triple spir-unknown-unknown -cl-std=c++ -emit-llvm -pedantic -verify -O0 -o - | FileCheck %s
+// expected-no-diagnostics
+
+// Test that the 'this' pointer is in the __generic address space.
+
+// FIXME: Add support for __constant address space.
+
+class C {
+public:
+  int v;
+  C() { v = 2; }
+  C(const C &c) { v = c.v; }
+  C &operator=(const C &c) {
+    v = c.v;
+    return *this;
+  }
+  int get() { return v; }
+};
+
+__global C c;
+
+__kernel void test__global() {
+  int i = c.get();
+  C c1(c);
+  C c2;
+  c2 = c1;
+}
+
+// CHECK-LABEL: @__cxx_global_var_init()
+// CHECK: call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* addrspacecast (%class.C addrspace(1)* @c to %class.C addrspace(4)*)) #4
+
+// Test that the address space is __generic for the constructor
+// CHECK-LABEL: @_ZNU3AS41CC1Ev(%class.C addrspace(4)* %this)
+// CHECK: entry:
+// CHECK:   %this.addr = alloca %class.C addrspace(4)*, align 4
+// CHECK:   store %class.C addrspace(4)* %this, %class.C addrspace(4)** %this.addr, align 4
+// CHECK:   %this1 = load %class.C addrspace(4)*, %class.C addrspace(4)** %this.addr, align 4
+// CHECK:   call void @_ZNU3AS41CC2Ev(%class.C addrspace(4)* %this1) #4
+// CHECK:   ret void
+
+// CHECK-LABEL: @_Z12test__globalv()
+
+// Test the address space of 'this' when invoking a method.
+// CHECK: %call = call i32 @_ZNU3AS41C3getEv(%class.C addrspace(4)* addrspacecast (%class.C addrspace(1)* @c to %class.C addrspace(4)*))
+
+// Test the address space of 'this' when invoking copy-constructor.
+// CHECK: %0 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK: call void @_ZNU3AS41CC1ERU3AS4KS_(%class.C addrspace(4)* %0, %class.C addrspace(4)* dereferenceable(4) addrspacecast (%class.C addrspace(1)* @c to %class.C addrspace(4)*))
+
+// Test the address space of 'this' when invoking a constructor.
+// CHECK:   %1 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK:   call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* %1) #4
+
+// Test the address space of 'this' when invoking assignment operator.
+// CHECK:   %2 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK:   %3 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK:   %call1 = call dereferenceable(4) %class.C addrspace(4)* @_ZNU3AS41CaSERU3AS4KS_(%class.C addrspace(4)* %3, %class.C addrspace(4)* dereferenceable(4) %2)
+
+#define TEST(AS)             \
+  __kernel void test##AS() { \
+    AS C c;                  \
+    int i = c.get();         \
+    C c1(c);                 \
+    C c2;                    \
+    c2 = c1;                 \
+  }
+
+TEST(__local)
+
+// CHECK-LABEL: _Z11test__localv
+// CHECK: @__cxa_guard_acquire
+
+// Test the address space of 'this' when invoking a method.
+// CHECK: call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* addrspacecast (%class.C addrspace(3)* @_ZZ11test__localvE1c to %class.C addrspace(4)*))
+
+// Test the address space of 'this' when invoking copy-constructor.
+// CHECK: %call = call i32 @_ZNU3AS41C3getEv(%class.C addrspace(4)* addrspacecast (%class.C addrspace(3)* @_ZZ11test__localvE1c to %class.C addrspace(4)*))
+
+// Test the address space of 'this' when invoking a constructor.
+// CHECK: %3 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK: call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* %3)
+
+// Test the address space of 'this' when invoking assignment operator.
+// CHECK:  %4 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK:  %5 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK:  %call1 = call dereferenceable(4) %class.C addrspace(4)* @_ZNU3AS41CaSERU3AS4KS_(%class.C addrspace(4)* %5, %class.C addrspace(4)* dereferenceable(4) %4)
+
+TEST(__private)
+
+// CHECK-LABEL: @_Z13test__privatev
+
+// Test the address space of 'this' when invoking a method.
+// CHECK:   %1 = addrspacecast %class.C* %c to %class.C addrspace(4)*
+// CHECK:   %call = call i32 @_ZNU3AS41C3getEv(%class.C addrspace(4)* %1)
+
+// Test the address space of 'this' when invoking a copy-constructor.
+// CHECK: %2 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK: %3 = addrspacecast %class.C* %c to %class.C addrspace(4)*
+// CHECK: call void @_ZNU3AS41CC1ERU3AS4KS_(%class.C addrspace(4)* %2, %class.C addrspace(4)* dereferenceable(4) %3)
+
+// Test the address space of 'this' when invoking a constructor.
+// CHECK: %4 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK:   call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* %4)
+
+// Test the address space of 'this' when invoking a copy-assignment.
+// CHECK:   %5 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK:   %6 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK:   %call1 = call dereferenceable(4) %class.C addrspace(4)* @_ZNU3AS41CaSERU3AS4KS_(%class.C addrspace(4)* %6, %class.C addrspace(4)* dereferenceable(4) %5)
+
+TEST()
+
+// CHECK-LABEL: @_Z4testv()
+// Test the address space of 'this' when invoking a method.
+// CHECK: %1 = addrspacecast %class.C* %c to %class.C addrspace(4)*
+// CHECK: %call = call i32 @_ZNU3AS41C3getEv(%class.C addrspace(4)* %1) #4
+
+// Test the address space of 'this' when invoking a copy-constructor.
+// CHECK: %2 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK: %3 = addrspacecast %class.C* %c to %class.C addrspace(4)*
+// CHECK: call void @_ZNU3AS41CC1ERU3AS4KS_(%class.C addrspace(4)* %2, %class.C addrspace(4)* dereferenceable(4) %3)
+
+// Test the address space of 'this' when invoking a constructor.
+// CHECK: %4 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK: call void @_ZNU3AS41CC1Ev(%class.C addrspace(4)* %4)
+
+// Test the address space of 'this' when invoking a copy-assignment.
+// CHECK: %5 = addrspacecast %class.C* %c1 to %class.C addrspace(4)*
+// CHECK: %6 = addrspacecast %class.C* %c2 to %class.C addrspace(4)*
+// CHECK: %call1 = call dereferenceable(4) %class.C addrspace(4)* @_ZNU3AS41CaSERU3AS4KS_(%class.C addrspace(4)* %6, %class.C addrspace(4)* dereferenceable(4) %5)
Index: tools/libclang/CIndex.cpp
===================================================================
--- tools/libclang/CIndex.cpp
+++ tools/libclang/CIndex.cpp
@@ -8370,7 +8370,7 @@
   const Decl *D = cxcursor::getCursorDecl(C);
   const CXXMethodDecl *Method =
       D ? dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()) : nullptr;
-  return (Method && (Method->getTypeQualifiers() & Qualifiers::Const)) ? 1 : 0;
+  return (Method && Method->getTypeQualifiers().hasConst()) ? 1 : 0;
 }
 
 unsigned clang_CXXMethod_isDefaulted(CXCursor C) {