Clean up some more uses of getAs<ObjCInterfaceType>() that Fariborz pointed
out.  The remaining ones are okay.

llvm-svn: 103973
diff --git a/clang/lib/Checker/BasicObjCFoundationChecks.cpp b/clang/lib/Checker/BasicObjCFoundationChecks.cpp
index e7275ca..b852e2a 100644
--- a/clang/lib/Checker/BasicObjCFoundationChecks.cpp
+++ b/clang/lib/Checker/BasicObjCFoundationChecks.cpp
@@ -521,11 +521,11 @@
   ObjCInterfaceDecl *Class = 0;
   switch (ME->getReceiverKind()) {
   case ObjCMessageExpr::Class:
-    Class = ME->getClassReceiver()->getAs<ObjCInterfaceType>()->getDecl();
+    Class = ME->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
     break;
 
   case ObjCMessageExpr::SuperClass:
-    Class = ME->getSuperType()->getAs<ObjCInterfaceType>()->getDecl();
+    Class = ME->getSuperType()->getAs<ObjCObjectType>()->getInterface();
     break;
 
   case ObjCMessageExpr::Instance: