Fix missing check for GC failure in number dictionary code.

Review URL: http://codereview.chromium.org/3781014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5640 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -8591,7 +8591,9 @@ Object* NumberDictionary::Set(uint32_t key,
   details = PropertyDetails(details.attributes(),
                             details.type(),
                             DetailsAt(entry).index());
-  SetEntry(entry, NumberDictionaryShape::AsObject(key), value, details);
+  Object* object_key = NumberDictionaryShape::AsObject(key);
+  if (object_key->IsFailure()) return object_key;
+  SetEntry(entry, object_key, value, details);
   return this;
 }