Cannot check the interceptor since it may not be ready yet.

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/353143003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -5337,7 +5337,7 @@ RUNTIME_FUNCTION(Runtime_AddProperty) {
 #ifdef DEBUG
   if (key->IsName()) {
     LookupIterator it(object, Handle<Name>::cast(key),
-                      LookupIterator::CHECK_OWN);
+                      LookupIterator::CHECK_OWN_REAL);
     JSReceiver::GetPropertyAttributes(&it);
     RUNTIME_ASSERT(!it.IsFound());
   } else {