Separating transitions from descriptors.

src/bootstrapper.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 2173 matching lines @@
           HandleScope inner;
           ASSERT(!to->HasFastProperties());
           // Add to dictionary.
           Handle<String> key = Handle<String>(descs->GetKey(i));
           Handle<Object> callbacks(descs->GetCallbacksObject(i));
           PropertyDetails d =
               PropertyDetails(details.attributes(), CALLBACKS, details.index());
           JSObject::SetNormalizedProperty(to, key, callbacks, d);
           break;
         }
-        case MAP_TRANSITION:
-        case CONSTANT_TRANSITION:
-          // Ignore non-properties.
-          break;
         case NORMAL:
           // Do not occur since the from object has fast properties.
         case HANDLER:
         case INTERCEPTOR:
+        case TRANSITION:
         case NONEXISTENT:
           // No element in instance descriptors have proxy or interceptor type.
           UNREACHABLE();
           break;
       }
     }
   } else {
     Handle<StringDictionary> properties =
         Handle<StringDictionary>(from->property_dictionary());
     int capacity = properties->Capacity();
@@ skipping 150 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal