Introduce instance type for transition arrays.

src/transitions-inl.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_INL_H_
 #define V8_TRANSITIONS_INL_H_
 
 #include "src/transitions.h"
 
 namespace v8 {
 namespace internal {
 
 
 TransitionArray* TransitionArray::cast(Object* object) {
   DCHECK(object->IsTransitionArray());
   return reinterpret_cast<TransitionArray*>(object);
 }
 
 
+Object* TransitionArray::next_link() { return get(kNextLinkIndex); }
+
+
+void TransitionArray::set_next_link(Object* next, WriteBarrierMode mode) {
+  return set(kNextLinkIndex, next, mode);
+}
+
+
 bool TransitionArray::HasPrototypeTransitions() {
   return get(kPrototypeTransitionsIndex) != Smi::FromInt(0);
 }
 
 
 FixedArray* TransitionArray::GetPrototypeTransitions() {
   DCHECK(HasPrototypeTransitions());  // Callers must check first.
   Object* prototype_transitions = get(kPrototypeTransitionsIndex);
   return FixedArray::cast(prototype_transitions);
 }
@@ skipping 136 matching lines @@
 
 void TransitionArray::SetNumberOfTransitions(int number_of_transitions) {
   DCHECK(number_of_transitions <= Capacity(this));
   set(kTransitionLengthIndex, Smi::FromInt(number_of_transitions));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TRANSITIONS_INL_H_