Introduce instance type for transition arrays.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index b321adec29915d2191caa77eb5ceac1fba37b598..7d530f48d48581e72332e7f7b6a54a44095fc135 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -965,6 +965,13 @@ Handle<WeakCell> Factory::NewWeakCell(Handle<HeapObject> value) {
 }
 
 
+Handle<TransitionArray> Factory::NewTransitionArray(int capacity) {
+  CALL_HEAP_FUNCTION(isolate(),
+                     isolate()->heap()->AllocateTransitionArray(capacity),
+                     TransitionArray);
+}
+
+
 Handle<AllocationSite> Factory::NewAllocationSite() {
   Handle<Map> map = allocation_site_map();
   Handle<AllocationSite> site = New<AllocationSite>(map, OLD_SPACE);