Introduce access control in propertyIsEnumerable....

src/runtime.cc

Index: src/runtime.cc
===================================================================
--- src/runtime.cc	(revision 620)
+++ src/runtime.cc	(working copy)
@@ -1905,10 +1905,8 @@
     return Heap::ToBoolean(object->HasElement(index));
   }
 
-  LookupResult result;
-  object->LocalLookup(key, &result);
-  if (!result.IsProperty()) return Heap::false_value();
-  return Heap::ToBoolean(!result.IsDontEnum());
+  PropertyAttributes att = object->GetLocalPropertyAttribute(key);
+  return Heap::ToBoolean(att != ABSENT && att != DONT_ENUM);
 }