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/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index f06a041..c0abc9e 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -365,7 +365,7 @@
     if (SD == 0 && &II == SuperID) {
       QualType T = Context.getPointerType(Context.getObjCInterfaceType(
                      getCurMethodDecl()->getClassInterface()));
-      return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper);
+      return new ObjCSuperExpr(Loc, T);
     }
   }
   if (D == 0) {