diff --git a/clang/include/clang/AST/DependenceFlags.h b/clang/include/clang/AST/DependenceFlags.h
--- a/clang/include/clang/AST/DependenceFlags.h
+++ b/clang/include/clang/AST/DependenceFlags.h
@@ -106,6 +106,32 @@
   // type dependency.
   return D & ~ExprDependence::Type;
 }
+inline ExprDependence turnValueToTypeDependence(ExprDependence D) {
+  // Type-dependent expressions are always be value-dependent.
+  if (D & ExprDependence::Value)
+    D |= ExprDependence::Type;
+  return D;
+}
+
+// Returned type-dependence will never have VariablyModified set.
+inline TypeDependence toTypeDependence(ExprDependence D) {
+  // Supported bits all have the same representation.
+  return static_cast<TypeDependence>(D & (ExprDependence::UnexpandedPack |
+                                          ExprDependence::Instantiation |
+                                          ExprDependence::Type));
+}
+inline TypeDependence toTypeDependence(NestedNameSpecifierDependence D) {
+  // Supported bits all have the same representation.
+  return static_cast<TypeDependence>(D);
+}
+inline TypeDependence toTypeDependence(TemplateNameDependence D) {
+  // Supported bits all have the same representation.
+  return static_cast<TypeDependence>(D);
+}
+inline TypeDependence toTypeDependence(TemplateArgumentDependence D) {
+  // Supported bits all have the same representation.
+  return static_cast<TypeDependence>(D);
+}
 
 inline NestedNameSpecifierDependence
 toNestedNameSpecifierDependendence(TypeDependence D) {
diff --git a/clang/include/clang/AST/LocInfoType.h b/clang/include/clang/AST/LocInfoType.h
--- a/clang/include/clang/AST/LocInfoType.h
+++ b/clang/include/clang/AST/LocInfoType.h
@@ -35,10 +35,7 @@
   TypeSourceInfo *DeclInfo;
 
   LocInfoType(QualType ty, TypeSourceInfo *TInfo)
-      : Type((TypeClass)LocInfo, ty, ty->isDependentType(),
-             ty->isInstantiationDependentType(), ty->isVariablyModifiedType(),
-             ty->containsUnexpandedParameterPack()),
-        DeclInfo(TInfo) {
+      : Type((TypeClass)LocInfo, ty, ty->getDependence()), DeclInfo(TInfo) {
     assert(getTypeClass() == (TypeClass)LocInfo && "LocInfo didn't fit in TC?");
   }
   friend class Sema;
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -1818,23 +1818,11 @@
 protected:
   friend class ASTContext;
 
-  Type(TypeClass tc, QualType canon, bool Dependent,
-       bool InstantiationDependent, bool VariablyModified,
-       bool ContainsUnexpandedParameterPack)
+  Type(TypeClass tc, QualType canon, TypeDependence Dependence)
       : ExtQualsTypeCommonBase(this,
                                canon.isNull() ? QualType(this_(), 0) : canon) {
-    auto Deps = TypeDependence::None;
-    if (Dependent)
-      Deps |= TypeDependence::Dependent | TypeDependence::Instantiation;
-    if (InstantiationDependent)
-      Deps |= TypeDependence::Instantiation;
-    if (ContainsUnexpandedParameterPack)
-      Deps |= TypeDependence::UnexpandedPack;
-    if (VariablyModified)
-      Deps |= TypeDependence::VariablyModified;
-
     TypeBits.TC = tc;
-    TypeBits.Dependence = static_cast<unsigned>(Deps);
+    TypeBits.Dependence = static_cast<unsigned>(Dependence);
     TypeBits.CacheValid = false;
     TypeBits.CachedLocalOrUnnamed = false;
     TypeBits.CachedLinkage = NoLinkage;
@@ -1844,41 +1832,11 @@
   // silence VC++ warning C4355: 'this' : used in base member initializer list
   Type *this_() { return this; }
 
-  void setDependent(bool D = true) {
-    if (!D) {
-      TypeBits.Dependence &= ~static_cast<unsigned>(TypeDependence::Dependent);
-      return;
-    }
-    TypeBits.Dependence |= static_cast<unsigned>(TypeDependence::Dependent |
-                                                 TypeDependence::Instantiation);
-  }
-
-  void setInstantiationDependent(bool D = true) {
-    if (D)
-      TypeBits.Dependence |=
-          static_cast<unsigned>(TypeDependence::Instantiation);
-    else
-      TypeBits.Dependence &=
-          ~static_cast<unsigned>(TypeDependence::Instantiation);
-  }
-
-  void setVariablyModified(bool VM = true) {
-    if (VM)
-      TypeBits.Dependence |=
-          static_cast<unsigned>(TypeDependence::VariablyModified);
-    else
-      TypeBits.Dependence &=
-          ~static_cast<unsigned>(TypeDependence::VariablyModified);
+  void setDependence(TypeDependence D) {
+    TypeBits.Dependence = static_cast<unsigned>(D);
   }
 
-  void setContainsUnexpandedParameterPack(bool PP = true) {
-    if (PP)
-      TypeBits.Dependence |=
-          static_cast<unsigned>(TypeDependence::UnexpandedPack);
-    else
-      TypeBits.Dependence &=
-          ~static_cast<unsigned>(TypeDependence::UnexpandedPack);
-  }
+  void addDependence(TypeDependence D) { setDependence(getDependence() | D); }
 
 public:
   friend class ASTReader;
@@ -2519,10 +2477,9 @@
   friend class ASTContext; // ASTContext creates these.
 
   BuiltinType(Kind K)
-      : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent),
-             /*InstantiationDependent=*/(K == Dependent),
-             /*VariablyModified=*/false,
-             /*Unexpanded parameter pack=*/false) {
+      : Type(Builtin, QualType(),
+             K == Dependent ? TypeDependence::DependentInstantiation
+                            : TypeDependence::None) {
     BuiltinTypeBits.Kind = K;
   }
 
@@ -2592,10 +2549,7 @@
   QualType ElementType;
 
   ComplexType(QualType Element, QualType CanonicalPtr)
-      : Type(Complex, CanonicalPtr, Element->isDependentType(),
-             Element->isInstantiationDependentType(),
-             Element->isVariablyModifiedType(),
-             Element->containsUnexpandedParameterPack()),
+      : Type(Complex, CanonicalPtr, Element->getDependence()),
         ElementType(Element) {}
 
 public:
@@ -2622,11 +2576,7 @@
   QualType Inner;
 
   ParenType(QualType InnerType, QualType CanonType)
-      : Type(Paren, CanonType, InnerType->isDependentType(),
-             InnerType->isInstantiationDependentType(),
-             InnerType->isVariablyModifiedType(),
-             InnerType->containsUnexpandedParameterPack()),
-        Inner(InnerType) {}
+      : Type(Paren, CanonType, InnerType->getDependence()), Inner(InnerType) {}
 
 public:
   QualType getInnerType() const { return Inner; }
@@ -2652,10 +2602,7 @@
   QualType PointeeType;
 
   PointerType(QualType Pointee, QualType CanonicalPtr)
-      : Type(Pointer, CanonicalPtr, Pointee->isDependentType(),
-             Pointee->isInstantiationDependentType(),
-             Pointee->isVariablyModifiedType(),
-             Pointee->containsUnexpandedParameterPack()),
+      : Type(Pointer, CanonicalPtr, Pointee->getDependence()),
         PointeeType(Pointee) {}
 
 public:
@@ -2703,10 +2650,7 @@
 
   AdjustedType(TypeClass TC, QualType OriginalTy, QualType AdjustedTy,
                QualType CanonicalPtr)
-      : Type(TC, CanonicalPtr, OriginalTy->isDependentType(),
-             OriginalTy->isInstantiationDependentType(),
-             OriginalTy->isVariablyModifiedType(),
-             OriginalTy->containsUnexpandedParameterPack()),
+      : Type(TC, CanonicalPtr, OriginalTy->getDependence()),
         OriginalTy(OriginalTy), AdjustedTy(AdjustedTy) {}
 
 public:
@@ -2755,10 +2699,7 @@
   QualType PointeeType;
 
   BlockPointerType(QualType Pointee, QualType CanonicalCls)
-      : Type(BlockPointer, CanonicalCls, Pointee->isDependentType(),
-             Pointee->isInstantiationDependentType(),
-             Pointee->isVariablyModifiedType(),
-             Pointee->containsUnexpandedParameterPack()),
+      : Type(BlockPointer, CanonicalCls, Pointee->getDependence()),
         PointeeType(Pointee) {}
 
 public:
@@ -2788,10 +2729,7 @@
 protected:
   ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef,
                 bool SpelledAsLValue)
-      : Type(tc, CanonicalRef, Referencee->isDependentType(),
-             Referencee->isInstantiationDependentType(),
-             Referencee->isVariablyModifiedType(),
-             Referencee->containsUnexpandedParameterPack()),
+      : Type(tc, CanonicalRef, Referencee->getDependence()),
         PointeeType(Referencee) {
     ReferenceTypeBits.SpelledAsLValue = SpelledAsLValue;
     ReferenceTypeBits.InnerRef = Referencee->isReferenceType();
@@ -2876,13 +2814,9 @@
 
   MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr)
       : Type(MemberPointer, CanonicalPtr,
-             Cls->isDependentType() || Pointee->isDependentType(),
-             (Cls->isInstantiationDependentType() ||
-              Pointee->isInstantiationDependentType()),
-             Pointee->isVariablyModifiedType(),
-             (Cls->containsUnexpandedParameterPack() ||
-              Pointee->containsUnexpandedParameterPack())),
-             PointeeType(Pointee), Class(Cls) {}
+             (Cls->getDependence() & ~TypeDependence::VariablyModified) |
+                 Pointee->getDependence()),
+        PointeeType(Pointee), Class(Cls) {}
 
 public:
   QualType getPointeeType() const { return PointeeType; }
@@ -3696,14 +3630,9 @@
   };
 
 protected:
-  FunctionType(TypeClass tc, QualType res,
-               QualType Canonical, bool Dependent,
-               bool InstantiationDependent,
-               bool VariablyModified, bool ContainsUnexpandedParameterPack,
-               ExtInfo Info)
-      : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
-             ContainsUnexpandedParameterPack),
-        ResultType(res) {
+  FunctionType(TypeClass tc, QualType res, QualType Canonical,
+               TypeDependence Dependence, ExtInfo Info)
+      : Type(tc, Canonical, Dependence), ResultType(res) {
     FunctionTypeBits.ExtInfo = Info.Bits;
   }
 
@@ -3754,9 +3683,10 @@
 
   FunctionNoProtoType(QualType Result, QualType Canonical, ExtInfo Info)
       : FunctionType(FunctionNoProto, Result, Canonical,
-                     /*Dependent=*/false, /*InstantiationDependent=*/false,
-                     Result->isVariablyModifiedType(),
-                     /*ContainsUnexpandedParameterPack=*/false, Info) {}
+                     Result->getDependence() &
+                         ~(TypeDependence::DependentInstantiation |
+                           TypeDependence::UnexpandedPack),
+                     Info) {}
 
 public:
   // No additional state past what FunctionType provides.
@@ -4248,9 +4178,9 @@
   UnresolvedUsingTypenameDecl *Decl;
 
   UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D)
-      : Type(UnresolvedUsing, QualType(), true, true, false,
-             /*ContainsUnexpandedParameterPack=*/false),
-        Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {}
+      : Type(UnresolvedUsing, QualType(),
+             TypeDependence::DependentInstantiation),
+        Decl(const_cast<UnresolvedUsingTypenameDecl *>(D)) {}
 
 public:
   UnresolvedUsingTypenameDecl *getDecl() const { return Decl; }
@@ -4279,11 +4209,8 @@
   friend class ASTContext; // ASTContext creates these.
 
   TypedefType(TypeClass tc, const TypedefNameDecl *D, QualType can)
-      : Type(tc, can, can->isDependentType(),
-             can->isInstantiationDependentType(),
-             can->isVariablyModifiedType(),
-             /*ContainsUnexpandedParameterPack=*/false),
-        Decl(const_cast<TypedefNameDecl*>(D)) {
+      : Type(tc, can, can->getDependence() & ~TypeDependence::UnexpandedPack),
+        Decl(const_cast<TypedefNameDecl *>(D)) {
     assert(!isa<TypedefType>(can) && "Invalid canonical type");
   }
 
@@ -4306,10 +4233,7 @@
 
   MacroQualifiedType(QualType UnderlyingTy, QualType CanonTy,
                      const IdentifierInfo *MacroII)
-      : Type(MacroQualified, CanonTy, UnderlyingTy->isDependentType(),
-             UnderlyingTy->isInstantiationDependentType(),
-             UnderlyingTy->isVariablyModifiedType(),
-             UnderlyingTy->containsUnexpandedParameterPack()),
+      : Type(MacroQualified, CanonTy, UnderlyingTy->getDependence()),
         UnderlyingTy(UnderlyingTy), MacroII(MacroII) {
     assert(isa<AttributedType>(UnderlyingTy) &&
            "Expected a macro qualified type to only wrap attributed types.");
@@ -4381,11 +4305,7 @@
   QualType TOType;
 
   TypeOfType(QualType T, QualType can)
-      : Type(TypeOf, can, T->isDependentType(),
-             T->isInstantiationDependentType(),
-             T->isVariablyModifiedType(),
-             T->containsUnexpandedParameterPack()),
-        TOType(T) {
+      : Type(TypeOf, can, T->getDependence()), TOType(T) {
     assert(!isa<TypedefType>(can) && "Invalid canonical type");
   }
 
@@ -4594,10 +4514,7 @@
 
   AttributedType(QualType canon, attr::Kind attrKind, QualType modified,
                  QualType equivalent)
-      : Type(Attributed, canon, equivalent->isDependentType(),
-             equivalent->isInstantiationDependentType(),
-             equivalent->isVariablyModifiedType(),
-             equivalent->containsUnexpandedParameterPack()),
+      : Type(Attributed, canon, equivalent->getDependence()),
         ModifiedType(modified), EquivalentType(equivalent) {
     AttributedTypeBits.AttrKind = attrKind;
   }
@@ -4699,18 +4616,16 @@
 
   /// Build a non-canonical type.
   TemplateTypeParmType(TemplateTypeParmDecl *TTPDecl, QualType Canon)
-      : Type(TemplateTypeParm, Canon, /*Dependent=*/true,
-             /*InstantiationDependent=*/true,
-             /*VariablyModified=*/false,
-             Canon->containsUnexpandedParameterPack()),
+      : Type(TemplateTypeParm, Canon,
+             TypeDependence::DependentInstantiation |
+                 (Canon->getDependence() & TypeDependence::UnexpandedPack)),
         TTPDecl(TTPDecl) {}
 
   /// Build the canonical type.
   TemplateTypeParmType(unsigned D, unsigned I, bool PP)
       : Type(TemplateTypeParm, QualType(this, 0),
-             /*Dependent=*/true,
-             /*InstantiationDependent=*/true,
-             /*VariablyModified=*/false, PP) {
+             TypeDependence::DependentInstantiation |
+                 (PP ? TypeDependence::UnexpandedPack : TypeDependence::None)) {
     CanTTPTInfo.Depth = D;
     CanTTPTInfo.Index = I;
     CanTTPTInfo.ParameterPack = PP;
@@ -4767,10 +4682,7 @@
   const TemplateTypeParmType *Replaced;
 
   SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon)
-      : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType(),
-             Canon->isInstantiationDependentType(),
-             Canon->isVariablyModifiedType(),
-             Canon->containsUnexpandedParameterPack()),
+      : Type(SubstTemplateTypeParm, Canon, Canon->getDependence()),
         Replaced(Param) {}
 
 public:
@@ -4867,23 +4779,16 @@
 /// the latter case, it is also a dependent type.
 class DeducedType : public Type {
 protected:
-  DeducedType(TypeClass TC, QualType DeducedAsType, bool IsDependent,
-              bool IsInstantiationDependent, bool ContainsParameterPack)
+  DeducedType(TypeClass TC, QualType DeducedAsType,
+              TypeDependence ExtraDependence)
       : Type(TC,
              // FIXME: Retain the sugared deduced type?
              DeducedAsType.isNull() ? QualType(this, 0)
                                     : DeducedAsType.getCanonicalType(),
-             IsDependent, IsInstantiationDependent,
-             /*VariablyModified=*/false, ContainsParameterPack) {
-    if (!DeducedAsType.isNull()) {
-      if (DeducedAsType->isDependentType())
-        setDependent();
-      if (DeducedAsType->isInstantiationDependentType())
-        setInstantiationDependent();
-      if (DeducedAsType->containsUnexpandedParameterPack())
-        setContainsUnexpandedParameterPack();
-    }
-  }
+             ExtraDependence | (DeducedAsType.isNull()
+                                    ? TypeDependence::None
+                                    : DeducedAsType->getDependence() &
+                                          ~TypeDependence::VariablyModified)) {}
 
 public:
   bool isSugared() const { return !isCanonicalUnqualified(); }
@@ -4912,7 +4817,7 @@
   ConceptDecl *TypeConstraintConcept;
 
   AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
-           bool IsDeducedAsDependent, bool IsDeducedAsPack, ConceptDecl *CD,
+           TypeDependence ExtraDependence, ConceptDecl *CD,
            ArrayRef<TemplateArgument> TypeConstraintArgs);
 
   const TemplateArgument *getArgBuffer() const {
@@ -4983,9 +4888,10 @@
                                     QualType DeducedAsType,
                                     bool IsDeducedAsDependent)
       : DeducedType(DeducedTemplateSpecialization, DeducedAsType,
-                    IsDeducedAsDependent || Template.isDependent(),
-                    IsDeducedAsDependent || Template.isInstantiationDependent(),
-                    Template.containsUnexpandedParameterPack()),
+                    toTypeDependence(Template.getDependence()) |
+                        (IsDeducedAsDependent
+                             ? TypeDependence::DependentInstantiation
+                             : TypeDependence::None)),
         Template(Template) {}
 
 public:
@@ -5187,10 +5093,8 @@
   QualType InjectedType;
 
   InjectedClassNameType(CXXRecordDecl *D, QualType TST)
-      : Type(InjectedClassName, QualType(), /*Dependent=*/true,
-             /*InstantiationDependent=*/true,
-             /*VariablyModified=*/false,
-             /*ContainsUnexpandedParameterPack=*/false),
+      : Type(InjectedClassName, QualType(),
+             TypeDependence::DependentInstantiation),
         Decl(D), InjectedType(TST) {
     assert(isa<TemplateSpecializationType>(TST));
     assert(!TST.hasQualifiers());
@@ -5269,11 +5173,8 @@
 class TypeWithKeyword : public Type {
 protected:
   TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc,
-                  QualType Canonical, bool Dependent,
-                  bool InstantiationDependent, bool VariablyModified,
-                  bool ContainsUnexpandedParameterPack)
-      : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
-             ContainsUnexpandedParameterPack) {
+                  QualType Canonical, TypeDependence Dependence)
+      : Type(tc, Canonical, Dependence) {
     TypeWithKeywordBits.Keyword = Keyword;
   }
 
@@ -5337,10 +5238,7 @@
   ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
                  QualType NamedType, QualType CanonType, TagDecl *OwnedTagDecl)
       : TypeWithKeyword(Keyword, Elaborated, CanonType,
-                        NamedType->isDependentType(),
-                        NamedType->isInstantiationDependentType(),
-                        NamedType->isVariablyModifiedType(),
-                        NamedType->containsUnexpandedParameterPack()),
+                        NamedType->getDependence()),
         NNS(NNS), NamedType(NamedType) {
     ElaboratedTypeBits.HasOwnedTagDecl = false;
     if (OwnedTagDecl) {
@@ -5411,10 +5309,9 @@
 
   DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
                     const IdentifierInfo *Name, QualType CanonType)
-      : TypeWithKeyword(Keyword, DependentName, CanonType, /*Dependent=*/true,
-                        /*InstantiationDependent=*/true,
-                        /*VariablyModified=*/false,
-                        NNS->containsUnexpandedParameterPack()),
+      : TypeWithKeyword(Keyword, DependentName, CanonType,
+                        TypeDependence::DependentInstantiation |
+                            toTypeDependence(NNS->getDependence())),
         NNS(NNS), Name(Name) {}
 
 public:
@@ -5551,10 +5448,9 @@
 
   PackExpansionType(QualType Pattern, QualType Canon,
                     Optional<unsigned> NumExpansions)
-      : Type(PackExpansion, Canon, /*Dependent=*/Pattern->isDependentType(),
-             /*InstantiationDependent=*/true,
-             /*VariablyModified=*/Pattern->isVariablyModifiedType(),
-             /*ContainsUnexpandedParameterPack=*/false),
+      : Type(PackExpansion, Canon,
+             (Pattern->getDependence() | TypeDependence::Instantiation) &
+                 ~TypeDependence::UnexpandedPack),
         Pattern(Pattern) {
     PackExpansionTypeBits.NumExpansions =
         NumExpansions ? *NumExpansions + 1 : 0;
@@ -5773,8 +5669,8 @@
                  bool isKindOf);
 
   ObjCObjectType(enum Nonce_ObjCInterface)
-        : Type(ObjCInterface, QualType(), false, false, false, false),
-          BaseType(QualType(this_(), 0)) {
+      : Type(ObjCInterface, QualType(), TypeDependence::None),
+        BaseType(QualType(this_(), 0)) {
     ObjCObjectTypeBits.NumProtocols = 0;
     ObjCObjectTypeBits.NumTypeArgs = 0;
     ObjCObjectTypeBits.IsKindOf = 0;
@@ -5989,11 +5885,7 @@
   QualType PointeeType;
 
   ObjCObjectPointerType(QualType Canonical, QualType Pointee)
-      : Type(ObjCObjectPointer, Canonical,
-             Pointee->isDependentType(),
-             Pointee->isInstantiationDependentType(),
-             Pointee->isVariablyModifiedType(),
-             Pointee->containsUnexpandedParameterPack()),
+      : Type(ObjCObjectPointer, Canonical, Pointee->getDependence()),
         PointeeType(Pointee) {}
 
 public:
@@ -6163,11 +6055,7 @@
   QualType ValueType;
 
   AtomicType(QualType ValTy, QualType Canonical)
-      : Type(Atomic, Canonical, ValTy->isDependentType(),
-             ValTy->isInstantiationDependentType(),
-             ValTy->isVariablyModifiedType(),
-             ValTy->containsUnexpandedParameterPack()),
-        ValueType(ValTy) {}
+      : Type(Atomic, Canonical, ValTy->getDependence()), ValueType(ValTy) {}
 
 public:
   /// Gets the type contained by this atomic type, i.e.
@@ -6198,10 +6086,7 @@
   bool isRead;
 
   PipeType(QualType elemType, QualType CanonicalPtr, bool isRead)
-      : Type(Pipe, CanonicalPtr, elemType->isDependentType(),
-             elemType->isInstantiationDependentType(),
-             elemType->isVariablyModifiedType(),
-             elemType->containsUnexpandedParameterPack()),
+      : Type(Pipe, CanonicalPtr, elemType->getDependence()),
         ElementType(elemType), isRead(isRead) {}
 
 public:
diff --git a/clang/include/clang/AST/TypeProperties.td b/clang/include/clang/AST/TypeProperties.td
--- a/clang/include/clang/AST/TypeProperties.td
+++ b/clang/include/clang/AST/TypeProperties.td
@@ -453,7 +453,9 @@
 let Class = EnumType in {
   def : Creator<[{
     QualType result = ctx.getEnumType(cast<EnumDecl>(declaration));
-    const_cast<Type*>(result.getTypePtr())->setDependent(dependent);
+    if (dependent)
+      const_cast<Type *>(result.getTypePtr())
+          ->addDependence(TypeDependence::DependentInstantiation);
     return result;
   }]>;
 }
@@ -462,7 +464,9 @@
   def : Creator<[{
     auto record = cast<RecordDecl>(declaration);
     QualType result = ctx.getRecordType(record);
-    const_cast<Type*>(result.getTypePtr())->setDependent(dependent);
+    if (dependent)
+      const_cast<Type *>(result.getTypePtr())
+          ->addDependence(TypeDependence::DependentInstantiation);
     return result;
   }]>;
 }
@@ -605,7 +609,9 @@
                                                  templateArguments,
                                                  *underlyingType);
     }
-    const_cast<Type*>(result.getTypePtr())->setDependent(dependent);
+    if (dependent)
+      const_cast<Type *>(result.getTypePtr())
+          ->addDependence(TypeDependence::DependentInstantiation);
     return result;
   }]>;
 }
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -29,6 +29,7 @@
 #include "clang/AST/DeclOpenMP.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/DeclarationName.h"
+#include "clang/AST/DependenceFlags.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprConcepts.h"
@@ -5122,8 +5123,12 @@
   void *Mem = Allocate(sizeof(AutoType) +
                        sizeof(TemplateArgument) * TypeConstraintArgs.size(),
                        TypeAlignment);
-  auto *AT = new (Mem) AutoType(DeducedType, Keyword, IsDependent, IsPack,
-                                TypeConstraintConcept, TypeConstraintArgs);
+  auto *AT = new (Mem) AutoType(
+      DeducedType, Keyword,
+      (IsDependent ? TypeDependence::DependentInstantiation
+                   : TypeDependence::None) |
+          (IsPack ? TypeDependence::UnexpandedPack : TypeDependence::None),
+      TypeConstraintConcept, TypeConstraintArgs);
   Types.push_back(AT);
   if (InsertPos)
     AutoTypes.InsertNode(AT, InsertPos);
@@ -5183,11 +5188,11 @@
 /// getAutoDeductType - Get type pattern for deducing against 'auto'.
 QualType ASTContext::getAutoDeductType() const {
   if (AutoDeductTy.isNull())
-    AutoDeductTy = QualType(
-      new (*this, TypeAlignment) AutoType(QualType(), AutoTypeKeyword::Auto,
-                                          /*dependent*/false, /*pack*/false,
-                                          /*concept*/nullptr, /*args*/{}),
-      0);
+    AutoDeductTy = QualType(new (*this, TypeAlignment)
+                                AutoType(QualType(), AutoTypeKeyword::Auto,
+                                         TypeDependence::None,
+                                         /*concept*/ nullptr, /*args*/ {}),
+                            0);
   return AutoDeductTy;
 }
 
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -20,6 +20,7 @@
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
+#include "clang/AST/DependenceFlags.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/NestedNameSpecifier.h"
 #include "clang/AST/NonTrivialTypeVisitor.h"
@@ -123,14 +124,15 @@
     //
     //   template<int ...N> int arr[] = {N...};
     : Type(tc, can,
-           et->isDependentType() || (sz && sz->isValueDependent()) ||
-               tc == DependentSizedArray,
-           et->isInstantiationDependentType() ||
-               (sz && sz->isInstantiationDependent()) ||
-               tc == DependentSizedArray,
-           (tc == VariableArray || et->isVariablyModifiedType()),
-           et->containsUnexpandedParameterPack() ||
-               (sz && sz->containsUnexpandedParameterPack())),
+           et->getDependence() |
+               (sz ? toTypeDependence(
+                         turnValueToTypeDependence(sz->getDependence()))
+                   : TypeDependence::None) |
+               (tc == VariableArray ? TypeDependence::VariablyModified
+                                    : TypeDependence::None) |
+               (tc == DependentSizedArray
+                    ? TypeDependence::DependentInstantiation
+                    : TypeDependence::None)),
       ElementType(et) {
   ArrayTypeBits.IndexTypeQuals = tq;
   ArrayTypeBits.SizeModifier = sm;
@@ -217,14 +219,16 @@
   E->Profile(ID, Context, true);
 }
 
-DependentVectorType::DependentVectorType(
-    const ASTContext &Context, QualType ElementType, QualType CanonType,
-    Expr *SizeExpr, SourceLocation Loc, VectorType::VectorKind VecKind)
-    : Type(DependentVector, CanonType, /*Dependent=*/true,
-           /*InstantiationDependent=*/true,
-           ElementType->isVariablyModifiedType(),
-           ElementType->containsUnexpandedParameterPack() ||
-               (SizeExpr && SizeExpr->containsUnexpandedParameterPack())),
+DependentVectorType::DependentVectorType(const ASTContext &Context,
+                                         QualType ElementType,
+                                         QualType CanonType, Expr *SizeExpr,
+                                         SourceLocation Loc,
+                                         VectorType::VectorKind VecKind)
+    : Type(DependentVector, CanonType,
+           TypeDependence::DependentInstantiation |
+               ElementType->getDependence() |
+               (SizeExpr ? toTypeDependence(SizeExpr->getDependence())
+                         : TypeDependence::None)),
       Context(Context), ElementType(ElementType), SizeExpr(SizeExpr), Loc(Loc) {
   VectorTypeBits.VecKind = VecKind;
 }
@@ -238,19 +242,16 @@
   SizeExpr->Profile(ID, Context, true);
 }
 
-DependentSizedExtVectorType::DependentSizedExtVectorType(const
-                                                         ASTContext &Context,
-                                                         QualType ElementType,
-                                                         QualType can,
-                                                         Expr *SizeExpr,
-                                                         SourceLocation loc)
-    : Type(DependentSizedExtVector, can, /*Dependent=*/true,
-           /*InstantiationDependent=*/true,
-           ElementType->isVariablyModifiedType(),
-           (ElementType->containsUnexpandedParameterPack() ||
-            (SizeExpr && SizeExpr->containsUnexpandedParameterPack()))),
-      Context(Context), SizeExpr(SizeExpr), ElementType(ElementType),
-      loc(loc) {}
+DependentSizedExtVectorType::DependentSizedExtVectorType(
+    const ASTContext &Context, QualType ElementType, QualType can,
+    Expr *SizeExpr, SourceLocation loc)
+    : Type(DependentSizedExtVector, can,
+           TypeDependence::DependentInstantiation |
+               ElementType->getDependence() |
+               (SizeExpr ? toTypeDependence(SizeExpr->getDependence())
+                         : TypeDependence::None)),
+      Context(Context), SizeExpr(SizeExpr), ElementType(ElementType), loc(loc) {
+}
 
 void
 DependentSizedExtVectorType::Profile(llvm::FoldingSetNodeID &ID,
@@ -260,15 +261,16 @@
   SizeExpr->Profile(ID, Context, true);
 }
 
-DependentAddressSpaceType::DependentAddressSpaceType(
-    const ASTContext &Context, QualType PointeeType, QualType can,
-    Expr *AddrSpaceExpr, SourceLocation loc)
-    : Type(DependentAddressSpace, can, /*Dependent=*/true,
-           /*InstantiationDependent=*/true,
-           PointeeType->isVariablyModifiedType(),
-           (PointeeType->containsUnexpandedParameterPack() ||
-            (AddrSpaceExpr &&
-             AddrSpaceExpr->containsUnexpandedParameterPack()))),
+DependentAddressSpaceType::DependentAddressSpaceType(const ASTContext &Context,
+                                                     QualType PointeeType,
+                                                     QualType can,
+                                                     Expr *AddrSpaceExpr,
+                                                     SourceLocation loc)
+    : Type(DependentAddressSpace, can,
+           TypeDependence::DependentInstantiation |
+               PointeeType->getDependence() |
+               (AddrSpaceExpr ? toTypeDependence(AddrSpaceExpr->getDependence())
+                              : TypeDependence::None)),
       Context(Context), AddrSpaceExpr(AddrSpaceExpr), PointeeType(PointeeType),
       loc(loc) {}
 
@@ -286,11 +288,7 @@
 
 VectorType::VectorType(TypeClass tc, QualType vecType, unsigned nElements,
                        QualType canonType, VectorKind vecKind)
-    : Type(tc, canonType, vecType->isDependentType(),
-           vecType->isInstantiationDependentType(),
-           vecType->isVariablyModifiedType(),
-           vecType->containsUnexpandedParameterPack()),
-      ElementType(vecType) {
+    : Type(tc, canonType, vecType->getDependence()), ElementType(vecType) {
   VectorTypeBits.VecKind = vecKind;
   VectorTypeBits.NumElements = nElements;
 }
@@ -652,14 +650,11 @@
   return OPT->isObjCClassType() || OPT->isObjCQualifiedClassType();
 }
 
-ObjCTypeParamType::ObjCTypeParamType(const ObjCTypeParamDecl *D,
-                                     QualType can,
+ObjCTypeParamType::ObjCTypeParamType(const ObjCTypeParamDecl *D, QualType can,
                                      ArrayRef<ObjCProtocolDecl *> protocols)
-    : Type(ObjCTypeParam, can, can->isDependentType(),
-           can->isInstantiationDependentType(),
-           can->isVariablyModifiedType(),
-           /*ContainsUnexpandedParameterPack=*/false),
-      OTPDecl(const_cast<ObjCTypeParamDecl*>(D)) {
+    : Type(ObjCTypeParam, can,
+           can->getDependence() & ~TypeDependence::UnexpandedPack),
+      OTPDecl(const_cast<ObjCTypeParamDecl *>(D)) {
   initialize(protocols);
 }
 
@@ -667,11 +662,7 @@
                                ArrayRef<QualType> typeArgs,
                                ArrayRef<ObjCProtocolDecl *> protocols,
                                bool isKindOf)
-    : Type(ObjCObject, Canonical, Base->isDependentType(),
-           Base->isInstantiationDependentType(),
-           Base->isVariablyModifiedType(),
-           Base->containsUnexpandedParameterPack()),
-      BaseType(Base) {
+    : Type(ObjCObject, Canonical, Base->getDependence()), BaseType(Base) {
   ObjCObjectTypeBits.IsKindOf = isKindOf;
 
   ObjCObjectTypeBits.NumTypeArgs = typeArgs.size();
@@ -682,13 +673,7 @@
            typeArgs.size() * sizeof(QualType));
 
   for (auto typeArg : typeArgs) {
-    if (typeArg->isDependentType())
-      setDependent();
-    else if (typeArg->isInstantiationDependentType())
-      setInstantiationDependent();
-
-    if (typeArg->containsUnexpandedParameterPack())
-      setContainsUnexpandedParameterPack();
+    addDependence(typeArg->getDependence() & ~TypeDependence::VariablyModified);
   }
   // Initialize the protocol qualifiers. The protocol storage is known
   // after we set number of type arguments.
@@ -2715,21 +2700,20 @@
 }
 
 DependentTemplateSpecializationType::DependentTemplateSpecializationType(
-                         ElaboratedTypeKeyword Keyword,
-                         NestedNameSpecifier *NNS, const IdentifierInfo *Name,
-                         ArrayRef<TemplateArgument> Args,
-                         QualType Canon)
-  : TypeWithKeyword(Keyword, DependentTemplateSpecialization, Canon, true, true,
-                    /*VariablyModified=*/false,
-                    NNS && NNS->containsUnexpandedParameterPack()),
-    NNS(NNS), Name(Name) {
+    ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
+    const IdentifierInfo *Name, ArrayRef<TemplateArgument> Args, QualType Canon)
+    : TypeWithKeyword(Keyword, DependentTemplateSpecialization, Canon,
+                      TypeDependence::DependentInstantiation |
+                          (NNS ? toTypeDependence(NNS->getDependence())
+                               : TypeDependence::None)),
+      NNS(NNS), Name(Name) {
   DependentTemplateSpecializationTypeBits.NumArgs = Args.size();
   assert((!NNS || NNS->isDependent()) &&
          "DependentTemplateSpecializatonType requires dependent qualifier");
   TemplateArgument *ArgBuffer = getArgBuffer();
   for (const TemplateArgument &Arg : Args) {
-    if (Arg.containsUnexpandedParameterPack())
-      setContainsUnexpandedParameterPack();
+    addDependence(toTypeDependence(Arg.getDependence() &
+                                   TemplateArgumentDependence::UnexpandedPack));
 
     new (ArgBuffer++) TemplateArgument(Arg);
   }
@@ -2972,10 +2956,8 @@
 FunctionProtoType::FunctionProtoType(QualType result, ArrayRef<QualType> params,
                                      QualType canonical,
                                      const ExtProtoInfo &epi)
-    : FunctionType(FunctionProto, result, canonical, result->isDependentType(),
-                   result->isInstantiationDependentType(),
-                   result->isVariablyModifiedType(),
-                   result->containsUnexpandedParameterPack(), epi.ExtInfo) {
+    : FunctionType(FunctionProto, result, canonical, result->getDependence(),
+                   epi.ExtInfo) {
   FunctionTypeBits.FastTypeQuals = epi.TypeQuals.getFastQualifiers();
   FunctionTypeBits.RefQualifier = epi.RefQualifier;
   FunctionTypeBits.NumParams = params.size();
@@ -2994,14 +2976,8 @@
   // Fill in the trailing argument array.
   auto *argSlot = getTrailingObjects<QualType>();
   for (unsigned i = 0; i != getNumParams(); ++i) {
-    if (params[i]->isDependentType())
-      setDependent();
-    else if (params[i]->isInstantiationDependentType())
-      setInstantiationDependent();
-
-    if (params[i]->containsUnexpandedParameterPack())
-      setContainsUnexpandedParameterPack();
-
+    addDependence(params[i]->getDependence() &
+                  ~TypeDependence::VariablyModified);
     argSlot[i] = params[i];
   }
 
@@ -3015,11 +2991,9 @@
       // Note that, before C++17, a dependent exception specification does
       // *not* make a type dependent; it's not even part of the C++ type
       // system.
-      if (ExceptionType->isInstantiationDependentType())
-        setInstantiationDependent();
-
-      if (ExceptionType->containsUnexpandedParameterPack())
-        setContainsUnexpandedParameterPack();
+      addDependence(
+          ExceptionType->getDependence() &
+          (TypeDependence::Instantiation | TypeDependence::UnexpandedPack));
 
       exnSlot[I++] = ExceptionType;
     }
@@ -3033,12 +3007,9 @@
     // Store the noexcept expression and context.
     *getTrailingObjects<Expr *>() = epi.ExceptionSpec.NoexceptExpr;
 
-    if (epi.ExceptionSpec.NoexceptExpr->isValueDependent() ||
-        epi.ExceptionSpec.NoexceptExpr->isInstantiationDependent())
-      setInstantiationDependent();
-
-    if (epi.ExceptionSpec.NoexceptExpr->containsUnexpandedParameterPack())
-      setContainsUnexpandedParameterPack();
+    addDependence(
+        toTypeDependence(epi.ExceptionSpec.NoexceptExpr->getDependence()) &
+        (TypeDependence::Instantiation | TypeDependence::UnexpandedPack));
   }
   // Fill in the FunctionDecl * in the exception specification if present.
   else if (getExceptionSpecType() == EST_Uninstantiated) {
@@ -3062,11 +3033,11 @@
     if (getExceptionSpecType() == EST_Dynamic ||
         getExceptionSpecType() == EST_DependentNoexcept) {
       assert(hasDependentExceptionSpec() && "type should not be canonical");
-      setDependent();
+      addDependence(TypeDependence::DependentInstantiation);
     }
   } else if (getCanonicalTypeInternal()->isDependentType()) {
     // Ask our canonical type whether our exception specification was dependent.
-    setDependent();
+    addDependence(TypeDependence::DependentInstantiation);
   }
 
   // Fill in the extra parameter info if present.
@@ -3229,10 +3200,10 @@
 }
 
 TypeOfExprType::TypeOfExprType(Expr *E, QualType can)
-    : Type(TypeOfExpr, can, E->isTypeDependent(),
-           E->isInstantiationDependent(),
-           E->getType()->isVariablyModifiedType(),
-           E->containsUnexpandedParameterPack()),
+    : Type(TypeOfExpr, can,
+           toTypeDependence(E->getDependence()) |
+               (E->getType()->getDependence() &
+                TypeDependence::VariablyModified)),
       TOExpr(E) {}
 
 bool TypeOfExprType::isSugared() const {
@@ -3252,13 +3223,15 @@
 }
 
 DecltypeType::DecltypeType(Expr *E, QualType underlyingType, QualType can)
-  // C++11 [temp.type]p2: "If an expression e involves a template parameter,
-  // decltype(e) denotes a unique dependent type." Hence a decltype type is
-  // type-dependent even if its expression is only instantiation-dependent.
-    : Type(Decltype, can, E->isInstantiationDependent(),
-           E->isInstantiationDependent(),
-           E->getType()->isVariablyModifiedType(),
-           E->containsUnexpandedParameterPack()),
+    // C++11 [temp.type]p2: "If an expression e involves a template parameter,
+    // decltype(e) denotes a unique dependent type." Hence a decltype type is
+    // type-dependent even if its expression is only instantiation-dependent.
+    : Type(Decltype, can,
+           toTypeDependence(E->getDependence()) |
+               (E->isInstantiationDependent() ? TypeDependence::Dependent
+                                              : TypeDependence::None) |
+               (E->getType()->getDependence() &
+                TypeDependence::VariablyModified)),
       E(E), UnderlyingType(underlyingType) {}
 
 bool DecltypeType::isSugared() const { return !E->isInstantiationDependent(); }
@@ -3279,13 +3252,9 @@
 }
 
 UnaryTransformType::UnaryTransformType(QualType BaseType,
-                                       QualType UnderlyingType,
-                                       UTTKind UKind,
+                                       QualType UnderlyingType, UTTKind UKind,
                                        QualType CanonicalType)
-    : Type(UnaryTransform, CanonicalType, BaseType->isDependentType(),
-           BaseType->isInstantiationDependentType(),
-           BaseType->isVariablyModifiedType(),
-           BaseType->containsUnexpandedParameterPack()),
+    : Type(UnaryTransform, CanonicalType, BaseType->getDependence()),
       BaseType(BaseType), UnderlyingType(UnderlyingType), UKind(UKind) {}
 
 DependentUnaryTransformType::DependentUnaryTransformType(const ASTContext &C,
@@ -3294,11 +3263,10 @@
      : UnaryTransformType(BaseType, C.DependentTy, UKind, QualType()) {}
 
 TagType::TagType(TypeClass TC, const TagDecl *D, QualType can)
-    : Type(TC, can, D->isDependentType(),
-           /*InstantiationDependent=*/D->isDependentType(),
-           /*VariablyModified=*/false,
-           /*ContainsUnexpandedParameterPack=*/false),
-      decl(const_cast<TagDecl*>(D)) {}
+    : Type(TC, can,
+           D->isDependentType() ? TypeDependence::DependentInstantiation
+                                : TypeDependence::None),
+      decl(const_cast<TagDecl *>(D)) {}
 
 static TagDecl *getInterestingTagDecl(TagDecl *decl) {
   for (auto I : decl->redecls()) {
@@ -3407,11 +3375,12 @@
   return isCanonicalUnqualified() ? nullptr : getDecl()->getIdentifier();
 }
 
-SubstTemplateTypeParmPackType::
-SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param,
-                              QualType Canon,
-                              const TemplateArgument &ArgPack)
-    : Type(SubstTemplateTypeParmPack, Canon, true, true, false, true),
+SubstTemplateTypeParmPackType::SubstTemplateTypeParmPackType(
+    const TemplateTypeParmType *Param, QualType Canon,
+    const TemplateArgument &ArgPack)
+    : Type(SubstTemplateTypeParmPack, Canon,
+           TypeDependence::DependentInstantiation |
+               TypeDependence::UnexpandedPack),
       Replaced(Param), Arguments(ArgPack.pack_begin()) {
   SubstTemplateTypeParmPackTypeBits.NumArgs = ArgPack.pack_size();
 }
@@ -3455,16 +3424,17 @@
   return false;
 }
 
-TemplateSpecializationType::
-TemplateSpecializationType(TemplateName T,
-                           ArrayRef<TemplateArgument> Args,
-                           QualType Canon, QualType AliasedType)
-  : Type(TemplateSpecialization,
-         Canon.isNull()? QualType(this, 0) : Canon,
-         Canon.isNull()? true : Canon->isDependentType(),
-         Canon.isNull()? true : Canon->isInstantiationDependentType(),
-         false,
-         T.containsUnexpandedParameterPack()), Template(T) {
+TemplateSpecializationType::TemplateSpecializationType(
+    TemplateName T, ArrayRef<TemplateArgument> Args, QualType Canon,
+    QualType AliasedType)
+    : Type(TemplateSpecialization, Canon.isNull() ? QualType(this, 0) : Canon,
+           (Canon.isNull()
+                ? TypeDependence::DependentInstantiation
+                : Canon->getDependence() & ~(TypeDependence::VariablyModified |
+                                             TypeDependence::UnexpandedPack)) |
+               (toTypeDependence(T.getDependence()) &
+                TypeDependence::UnexpandedPack)),
+      Template(T) {
   TemplateSpecializationTypeBits.NumArgs = Args.size();
   TemplateSpecializationTypeBits.TypeAlias = !AliasedType.isNull();
 
@@ -3485,13 +3455,11 @@
     // U<T> is always non-dependent, irrespective of the type T.
     // However, U<Ts> contains an unexpanded parameter pack, even though
     // its expansion (and thus its desugared type) doesn't.
-    if (Arg.isInstantiationDependent())
-      setInstantiationDependent();
-    if (Arg.getKind() == TemplateArgument::Type &&
-        Arg.getAsType()->isVariablyModifiedType())
-      setVariablyModified();
-    if (Arg.containsUnexpandedParameterPack())
-      setContainsUnexpandedParameterPack();
+    addDependence(toTypeDependence(Arg.getDependence()) &
+                  ~TypeDependence::Dependent);
+    if (Arg.getKind() == TemplateArgument::Type)
+      addDependence(Arg.getAsType()->getDependence() &
+                    TypeDependence::VariablyModified);
     new (TemplateArgs++) TemplateArgument(Arg);
   }
 
@@ -4178,19 +4146,18 @@
 }
 
 AutoType::AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
-                   bool IsDeducedAsDependent, bool IsDeducedAsPack,
+                   TypeDependence ExtraDependence,
                    ConceptDecl *TypeConstraintConcept,
                    ArrayRef<TemplateArgument> TypeConstraintArgs)
-    : DeducedType(Auto, DeducedAsType, IsDeducedAsDependent,
-                  IsDeducedAsDependent, IsDeducedAsPack) {
+    : DeducedType(Auto, DeducedAsType, ExtraDependence) {
   AutoTypeBits.Keyword = (unsigned)Keyword;
   AutoTypeBits.NumArgs = TypeConstraintArgs.size();
   this->TypeConstraintConcept = TypeConstraintConcept;
   if (TypeConstraintConcept) {
     TemplateArgument *ArgBuffer = getArgBuffer();
     for (const TemplateArgument &Arg : TypeConstraintArgs) {
-      if (Arg.containsUnexpandedParameterPack())
-        setContainsUnexpandedParameterPack();
+      addDependence(toTypeDependence(
+          Arg.getDependence() & TemplateArgumentDependence::UnexpandedPack));
 
       new (ArgBuffer++) TemplateArgument(Arg);
     }