silence release-assert warnings.

llvm-svn: 57392
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 9849fb6..0c45c55 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -72,9 +72,9 @@
     }
     
     isClassMessage = true;
-  } else if (const PredefinedExpr *PDE =
-               dyn_cast<PredefinedExpr>(E->getReceiver())) {
-    assert(PDE->getIdentType() == PredefinedExpr::ObjCSuper);
+  } else if (isa<PredefinedExpr>(E->getReceiver())) {
+    assert(cast<PredefinedExpr>(E->getReceiver())->getIdentType() == 
+             PredefinedExpr::ObjCSuper);
     isSuperMessage = true;
     Receiver = LoadObjCSelf();
   } else {