Moving prototype transitions into the header of the transition array.

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 990 matching lines @@
       } else {
         ASSERT(e->IsUndefined());
       }
     }
   }
 }
 
 
 void Map::ZapTransitions() {
   TransitionArray* transition_array = transitions();
-  if (transition_array == NULL) return;
   MemsetPointer(transition_array->data_start(),
                 GetHeap()->the_hole_value(),
                 transition_array->length());
 }
 
 
 void Map::ZapPrototypeTransitions() {
   FixedArray* proto_transitions = prototype_transitions();
   MemsetPointer(proto_transitions->data_start(),
                 GetHeap()->the_hole_value(),
                 proto_transitions->length());
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal