Introduce instance type for transition arrays.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 45c6c1c6036b28614b2f12d9795616968a404c60..06f24e58f50d202a452ad1a73d7e79922495c3c5 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -966,6 +966,13 @@ 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);