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

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 1484)
+++ src/objects-inl.h	(working copy)
@@ -52,6 +52,13 @@
 }
 
 
+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());                 \