Changed runtime system to preserve the global property cells for deleted prop...

src/objects-inl.h

 // Copyright 2006-2008 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 34 matching lines @@
 PropertyDetails::PropertyDetails(Smi* smi) {
   value_ = smi->value();
 }
 
 
 Smi* PropertyDetails::AsSmi() {
   return Smi::FromInt(value_);
 }
 
 
+PropertyDetails PropertyDetails::AsDeleted() {
+  PropertyDetails d(DONT_ENUM, NORMAL);
+  Smi* smi = Smi::FromInt(AsSmi()->value() | DeletedField::encode(1));
+  return PropertyDetails(smi);
+}
+
+
 #define CAST_ACCESSOR(type)                     \
   type* type::cast(Object* object) {            \
     ASSERT(object->Is##type());                 \
     return reinterpret_cast<type*>(object);     \
   }
 
 
 #define INT_ACCESSORS(holder, name, offset)                             \
   int holder::name() { return READ_INT_FIELD(this, offset); }           \
   void holder::set_##name(int value) { WRITE_INT_FIELD(this, offset, value); }
@@ skipping 2497 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_