Directly store the transition target on LookupResult in TransitionResult.

src/hydrogen-instructions.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 4358 matching lines @@
     Representation representation) {
   ASSERT(offset >= 0);
   return HObjectAccess(kBackingStore, offset, representation,
                        Handle<String>::null(), false, false);
 }
 
 
 HObjectAccess HObjectAccess::ForField(Handle<Map> map,
                                       LookupResult* lookup,
                                       Handle<String> name) {
-  ASSERT(lookup->IsField() || lookup->IsTransitionToField(*map));
+  ASSERT(lookup->IsField() || lookup->IsTransitionToField());
   int index;
   Representation representation;
   if (lookup->IsField()) {
     index = lookup->GetLocalFieldIndexFromMap(*map);
     representation = lookup->representation();
   } else {
-    Map* transition = lookup->GetTransitionMapFromMap(*map);
+    Map* transition = lookup->GetTransitionTarget();
     int descriptor = transition->LastAdded();
     index = transition->instance_descriptors()->GetFieldIndex(descriptor) -
         map->inobject_properties();
     PropertyDetails details =
         transition->instance_descriptors()->GetDetails(descriptor);
     representation = details.representation();
   }
   if (index < 0) {
     // Negative property indices are in-object properties, indexed
     // from the end of the fixed part of the object.
@@ skipping 117 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal