Index: cfe/trunk/lib/CodeGen/CGDeclCXX.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CGDeclCXX.cpp
+++ cfe/trunk/lib/CodeGen/CGDeclCXX.cpp
@@ -571,9 +571,10 @@
   FinishFunction();
 }
 
-void CodeGenFunction::GenerateCXXGlobalDtorsFunc(llvm::Function *Fn,
-                  const std::vector<std::pair<llvm::WeakVH, llvm::Constant*> >
-                                                &DtorsAndObjects) {
+void CodeGenFunction::GenerateCXXGlobalDtorsFunc(
+    llvm::Function *Fn,
+    const std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>>
+        &DtorsAndObjects) {
   {
     auto NL = ApplyDebugLocation::CreateEmpty(*this);
     StartFunction(GlobalDecl(), getContext().VoidTy, Fn,
Index: cfe/trunk/lib/CodeGen/CGObjCMac.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CGObjCMac.cpp
+++ cfe/trunk/lib/CodeGen/CGObjCMac.cpp
@@ -886,7 +886,7 @@
 
   /// Cached reference to the class for constant strings. This value has type
   /// int * but is actually an Obj-C class pointer.
-  llvm::WeakVH ConstantStringClassRef;
+  llvm::WeakTrackingVH ConstantStringClassRef;
 
   /// \brief The LLVM type corresponding to NSConstantString.
   llvm::StructType *NSConstantStringType = nullptr;
Index: cfe/trunk/lib/CodeGen/CodeGenFunction.h
===================================================================
--- cfe/trunk/lib/CodeGen/CodeGenFunction.h
+++ cfe/trunk/lib/CodeGen/CodeGenFunction.h
@@ -3470,9 +3470,10 @@
 
   /// GenerateCXXGlobalDtorsFunc - Generates code for destroying global
   /// variables.
-  void GenerateCXXGlobalDtorsFunc(llvm::Function *Fn,
-                                  const std::vector<std::pair<llvm::WeakVH,
-                                  llvm::Constant*> > &DtorsAndObjects);
+  void GenerateCXXGlobalDtorsFunc(
+      llvm::Function *Fn,
+      const std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>>
+          &DtorsAndObjects);
 
   void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
                                         const VarDecl *D,
Index: cfe/trunk/lib/CodeGen/CodeGenModule.h
===================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.h
+++ cfe/trunk/lib/CodeGen/CodeGenModule.h
@@ -349,8 +349,8 @@
   /// List of global values which are required to be present in the object file;
   /// bitcast to i8*. This is used for forcing visibility of symbols which may
   /// otherwise be optimized out.
-  std::vector<llvm::WeakVH> LLVMUsed;
-  std::vector<llvm::WeakVH> LLVMCompilerUsed;
+  std::vector<llvm::WeakTrackingVH> LLVMUsed;
+  std::vector<llvm::WeakTrackingVH> LLVMCompilerUsed;
 
   /// Store the list of global constructors and their respective priorities to
   /// be emitted when the translation unit is complete.
@@ -421,7 +421,7 @@
   SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
 
   /// Global destructor functions and arguments that need to run on termination.
-  std::vector<std::pair<llvm::WeakVH,llvm::Constant*> > CXXGlobalDtors;
+  std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>> CXXGlobalDtors;
 
   /// \brief The complete set of modules that has been imported.
   llvm::SetVector<clang::Module *> ImportedModules;
@@ -438,7 +438,7 @@
 
   /// Cached reference to the class for constant strings. This value has type
   /// int * but is actually an Obj-C class pointer.
-  llvm::WeakVH CFConstantStringClassRef;
+  llvm::WeakTrackingVH CFConstantStringClassRef;
 
   /// \brief The type used to describe the state of a fast enumeration in
   /// Objective-C's for..in loop.
Index: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.cpp
+++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp
@@ -1150,7 +1150,7 @@
 }
 
 static void emitUsed(CodeGenModule &CGM, StringRef Name,
-                     std::vector<llvm::WeakVH> &List) {
+                     std::vector<llvm::WeakTrackingVH> &List) {
   // Don't create llvm.used if there is no need.
   if (List.empty())
     return;