Fix <rdar://problem/6248764> parser rejects: bad receiver type 'CFStringRef'.

Downgrade an error to a warning (for GCC compatibility).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprObjC.cpp b/lib/Sema/SemaExprObjC.cpp
index 5be8460..f571068 100644
--- a/lib/Sema/SemaExprObjC.cpp
+++ b/lib/Sema/SemaExprObjC.cpp
@@ -464,7 +464,7 @@
     if (Method && DiagnoseUseOfDecl(Method, receiverLoc))
       return true;
   } else {
-    Diag(lbrac, diag::error_bad_receiver_type)
+    Diag(lbrac, diag::warn_bad_receiver_type)
       << RExpr->getType() << RExpr->getSourceRange();
     return true;
   }