Pretenure prototype transitions array.

src/transitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TRANSITIONS_H_
 #define V8_TRANSITIONS_H_
 
 #include "src/checks.h"
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
@@ skipping 101 matching lines @@
     if (proto_transitions->length() == 0) return 0;
     Object* raw = proto_transitions->get(kProtoTransitionNumberOfEntriesOffset);
     return Smi::cast(raw)->value();
   }
   static int NumberOfPrototypeTransitionsForTest(Map* map);
 
   static void SetNumberOfPrototypeTransitions(FixedArray* proto_transitions,
                                               int value);
 
   inline FixedArray* GetPrototypeTransitions();
-  inline void SetPrototypeTransitions(
-      FixedArray* prototype_transitions,
-      WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
+  inline void SetPrototypeTransitions(FixedArray* prototype_transitions);
   inline Object** GetPrototypeTransitionsSlot();
   inline bool HasPrototypeTransitions();
 
   // ===== ITERATION =====
 
   typedef void (*TraverseCallback)(Map* map, void* data);
 
   // Traverse the transition tree in postorder.
   static void TraverseTransitionTree(Map* map, TraverseCallback callback,
                                      void* data) {
@@ skipping 184 matching lines @@
   static void ZapTransitionArray(TransitionArray* transitions);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TRANSITIONS_H_