Handle CALLBACKS correctly in IsProperty functions.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1970 matching lines @@
 
 
 AccessorDescriptor* DescriptorArray::GetCallbacks(int descriptor_number) {
   ASSERT(GetType(descriptor_number) == CALLBACKS);
   Foreign* p = Foreign::cast(GetCallbacksObject(descriptor_number));
   return reinterpret_cast<AccessorDescriptor*>(p->foreign_address());
 }
 
 
 bool DescriptorArray::IsProperty(int descriptor_number) {
-  return IsRealProperty(GetType(descriptor_number));
+  Entry entry(this, descriptor_number);
+  return IsPropertyDescriptor(&entry);
 }
 
 
 bool DescriptorArray::IsTransitionOnly(int descriptor_number) {
   switch (GetType(descriptor_number)) {
     case MAP_TRANSITION:
     case CONSTANT_TRANSITION:
     case ELEMENTS_TRANSITION:
       return true;
     case CALLBACKS: {
@@ skipping 2922 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_