Move field index into property details, freeing up the value slot of fields.

src/handles.cc

 // 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 784 matching lines @@
     for (int i = 0; i < descs->number_of_descriptors(); i++) {
       PropertyDetails details = descs->GetDetails(i);
       Object* key = descs->GetKey(i);
       if (!(details.IsDontEnum() || key->IsSymbol())) {
         if (i < real_size) ++enum_size;
         storage->set(index, key);
         if (!indices.is_null()) {
           if (details.type() != FIELD) {
             indices = Handle<FixedArray>();
           } else {
-            int field_index = Descriptor::IndexFromValue(descs->GetValue(i));
+            int field_index = descs->GetFieldIndex(i);
             if (field_index >= map->inobject_properties()) {
               field_index = -(field_index - map->inobject_properties() + 1);
             }
             indices->set(index, Smi::FromInt(field_index));
           }
         }
         index++;
       }
     }
     ASSERT(index == storage->length());
@@ skipping 107 matching lines @@
   data->next = prev_next_;
   data->limit = prev_limit_;
 #ifdef DEBUG
   handles_detached_ = true;
 #endif
   return deferred;
 }
 
 
 } }  // namespace v8::internal