Promoting elements transitions to their own field.

src/objects-debug.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 910 matching lines @@
 
 bool DescriptorArray::IsConsistentWithBackPointers(Map* current_map) {
   for (int i = 0; i < number_of_descriptors(); ++i) {
     switch (GetType(i)) {
       case MAP_TRANSITION:
       case CONSTANT_TRANSITION:
         if (!CheckOneBackPointer(current_map, GetValue(i))) {
           return false;
         }
         break;
-      case ELEMENTS_TRANSITION: {
-        Object* object = GetValue(i);
-        if (!CheckOneBackPointer(current_map, object)) {
-          return false;
-        }
-        if (object->IsFixedArray()) {
-          FixedArray* array = FixedArray::cast(object);
-          for (int i = 0; i < array->length(); ++i) {
-            if (!CheckOneBackPointer(current_map, array->get(i))) {
-              return false;
-            }
-          }
-        }
-        break;
-      }
       case CALLBACKS: {
         Object* object = GetValue(i);
         if (object->IsAccessorPair()) {
           AccessorPair* accessors = AccessorPair::cast(object);
           if (!CheckOneBackPointer(current_map, accessors->getter())) {
             return false;
           }
           if (!CheckOneBackPointer(current_map, accessors->setter())) {
             return false;
           }
@@ skipping 67 matching lines @@
   FixedArray* proto_transitions = prototype_transitions();
   MemsetPointer(proto_transitions->data_start(),
                 GetHeap()->the_hole_value(),
                 proto_transitions->length());
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal