add tbaa metadata to vtable pointer loads/stores

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153447 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index 8f9cdcd..5719afb 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -448,6 +448,7 @@
   bool shouldUseTBAA() const { return TBAA != 0; }
 
   llvm::MDNode *getTBAAInfo(QualType QTy);
+  llvm::MDNode *getTBAAInfoForVTablePtr();
 
   bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);