Implement Obj-C ivar references to aggregates.

Implement Obj-C lvalue message sends (aggregate returns).

Update several places to emit more precise ErrorUnsupported warnings
  for currently unimplemented Obj-C features (main missing chunks are
  property references, Obj-C exception handling, and the for ... in
  syntax).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55234 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index 37b242e..0d82e32 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -272,7 +272,9 @@
   LValue EmitLValueForField(llvm::Value* Base, FieldDecl* Field,
                             bool isUnion, unsigned CVRQualifiers);
       
+  LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
   LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
+
   //===--------------------------------------------------------------------===//
   //                         Scalar Expression Emission
   //===--------------------------------------------------------------------===//