Pretenure prototype transitions array.

BUG=

Review URL: https://codereview.chromium.org/1513313003

Cr-Commit-Position: refs/heads/master@{#32790}

src/transitions-inl.h

@@ -37,10 +37,9 @@ FixedArray* TransitionArray::GetPrototypeTransitions() {
 }
 
 
-void TransitionArray::SetPrototypeTransitions(FixedArray* transitions,
-                                              WriteBarrierMode mode) {
+void TransitionArray::SetPrototypeTransitions(FixedArray* transitions) {
   DCHECK(transitions->IsFixedArray());
-  set(kPrototypeTransitionsIndex, transitions, mode);
+  set(kPrototypeTransitionsIndex, transitions);
 }
 
 

src/transitions.cc

@@ -269,7 +269,7 @@ Handle<FixedArray> TransitionArray::GrowPrototypeTransitionArray(
   new_capacity = Min(kMaxCachedPrototypeTransitions, new_capacity);
   DCHECK_GT(new_capacity, capacity);
   int grow_by = new_capacity - capacity;
-  array = isolate->factory()->CopyFixedArrayAndGrow(array, grow_by);
+  array = isolate->factory()->CopyFixedArrayAndGrow(array, grow_by, TENURED);
   if (capacity < 0) {
     // There was no prototype transitions array before, so the size
     // couldn't be copied. Initialize it explicitly.

src/transitions.h

@@ -119,9 +119,7 @@ class TransitionArray: public FixedArray {
                                               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();