Make index translate/inobject only rely on the map.

src/property.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 132 matching lines @@
 
   int field_index() {
     ASSERT(is_field_index());
     return value();
   }
   int header_index() {
     ASSERT(is_header_index());
     return value();
   }
 
-  bool is_inobject(Handle<JSObject> holder) {
+  bool is_inobject(Map* map) {
     if (is_header_index()) return true;
-    return field_index() < holder->map()->inobject_properties();
+    return field_index() < map->inobject_properties();
   }
 
-  int translate(Handle<JSObject> holder) {
+  int translate(Map* map) {
     if (is_header_index()) return header_index();
-    int index = field_index() - holder->map()->inobject_properties();
+    int index = field_index() - map->inobject_properties();
     if (index >= 0) return index;
-    return index + holder->map()->instance_size() / kPointerSize;
+    return index + map->instance_size() / kPointerSize;
   }
 
  private:
   static const int kHeaderIndexBit = 1 << 31;
   static const int kIndexMask = ~kHeaderIndexBit;
 
   int value() { return index_ & kIndexMask; }
 
   PropertyIndex(int index, bool is_header_based)
       : index_(index | (is_header_based ? kHeaderIndexBit : 0)) {
@@ skipping 330 matching lines @@
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_