Moved lastadded from DescriptorArray to Map. Renamed kLastAdded to kEnumCache.

src/ic.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 1498 matching lines @@
       break;
     }
     case INTERCEPTOR:
       ASSERT(!receiver->GetNamedInterceptor()->setter()->IsUndefined());
       code = isolate()->stub_cache()->ComputeStoreInterceptor(
           name, receiver, strict_mode);
       break;
     case CONSTANT_FUNCTION:
       return;
     case TRANSITION: {
-      Map* value = lookup->GetTransitionTarget();
-      Handle<Map> transition(Map::cast(value));
+      Handle<Map> transition(lookup->GetTransitionTarget());
+      int descriptor = transition->LastAdded();
+
       DescriptorArray* target_descriptors = transition->instance_descriptors();
-      int descriptor = target_descriptors->LastAdded();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
       if (details.type() != FIELD || details.attributes() != NONE) return;
 
       int field_index = target_descriptors->GetFieldIndex(descriptor);
       code = isolate()->stub_cache()->ComputeStoreField(
           name, receiver, field_index, transition, strict_mode);
 
       break;
     }
@@ skipping 440 matching lines @@
   Handle<Code> code;
 
   switch (type) {
     case FIELD:
       code = isolate()->stub_cache()->ComputeKeyedStoreField(
           name, receiver, lookup->GetFieldIndex(),
           Handle<Map>::null(), strict_mode);
       break;
     case TRANSITION: {
       Handle<Map> transition(lookup->GetTransitionTarget());
+      int descriptor = transition->LastAdded();
 
       DescriptorArray* target_descriptors = transition->instance_descriptors();
-      int descriptor = target_descriptors->LastAdded();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
       if (details.type() == FIELD && details.attributes() == NONE) {
         int field_index = target_descriptors->GetFieldIndex(descriptor);
         code = isolate()->stub_cache()->ComputeKeyedStoreField(
             name, receiver, field_index, transition, strict_mode);
         break;
       }
       // fall through.
     }
@@ skipping 700 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal