Restore r184205 and associated commits (after commit of r185290)

This allows clang to use the backend parameter attribute 'returned' when generating 'this'-returning constructors and destructors in ARM and MSVC C++ ABIs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185291 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGClass.cpp b/lib/CodeGen/CGClass.cpp
index 9b34ece..c522059 100644
--- a/lib/CodeGen/CGClass.cpp
+++ b/lib/CodeGen/CGClass.cpp
@@ -1662,11 +1662,8 @@
   }
 
   // Non-trivial constructors are handled in an ABI-specific manner.
-  llvm::Value *Callee = CGM.getCXXABI().EmitConstructorCall(*this, D, Type,
-                            ForVirtualBase, Delegating, This, ArgBeg, ArgEnd);
-  if (CGM.getCXXABI().HasThisReturn(CurGD) &&
-      CGM.getCXXABI().HasThisReturn(GlobalDecl(D, Type)))
-     CalleeWithThisReturn = Callee;
+  CGM.getCXXABI().EmitConstructorCall(*this, D, Type, ForVirtualBase,
+                                      Delegating, This, ArgBeg, ArgEnd);
 }
 
 void
@@ -1758,9 +1755,6 @@
   llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(Ctor, CtorType);
   EmitCall(CGM.getTypes().arrangeCXXConstructorDeclaration(Ctor, CtorType),
            Callee, ReturnValueSlot(), DelegateArgs, Ctor);
-  if (CGM.getCXXABI().HasThisReturn(CurGD) &&
-      CGM.getCXXABI().HasThisReturn(GlobalDecl(Ctor, CtorType)))
-     CalleeWithThisReturn = Callee;
 }
 
 namespace {
@@ -1827,9 +1821,6 @@
   EmitCXXMemberCall(DD, SourceLocation(), Callee, ReturnValueSlot(), This,
                     VTT, getContext().getPointerType(getContext().VoidPtrTy),
                     0, 0);
-  if (CGM.getCXXABI().HasThisReturn(CurGD) &&
-      CGM.getCXXABI().HasThisReturn(GlobalDecl(DD, Type)))
-     CalleeWithThisReturn = Callee;
 }
 
 namespace {