IRgen optimization: cache the value of 'this' and 'vtt' instead of

repeatedly reloading from an alloca.  We still need to create the alloca
for debug info purposes (although we currently create it in all cases
because of some abstraction boundaries that're hard to break down).

llvm-svn: 96403

clang/lib/CodeGen/CGClass.cpp

@@ -1405,11 +1405,3 @@ void CodeGenFunction::InitializeVtablePtrsRecursive(
   // Store address point
   Builder.CreateStore(VtableAddressPoint, VtableField);
 }
-
-llvm::Value *CodeGenFunction::LoadCXXVTT() {
-  assert((isa<CXXConstructorDecl>(CurFuncDecl) ||
-          isa<CXXDestructorDecl>(CurFuncDecl)) &&
-         "Must be in a C++ ctor or dtor to load the vtt parameter");
-
-  return Builder.CreateLoad(LocalDeclMap[CXXVTTDecl], "vtt");
-}