Add a new expression class, ObjCSuperExpr, to handle the Objective-C 'super'. Remove ObjCThis from PredefinedExpr

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58698 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjC.cpp b/lib/CodeGen/CGObjC.cpp
index c0260ad..cb82040 100644
--- a/lib/CodeGen/CGObjC.cpp
+++ b/lib/CodeGen/CGObjC.cpp
@@ -72,9 +72,7 @@
     }
     
     isClassMessage = true;
-  } else if (isa<PredefinedExpr>(E->getReceiver())) {
-    assert(cast<PredefinedExpr>(E->getReceiver())->getIdentType() == 
-             PredefinedExpr::ObjCSuper);
+  } else if (isa<ObjCSuperExpr>(E->getReceiver())) {
     isSuperMessage = true;
     Receiver = LoadObjCSelf();
   } else {