Reland of 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
@@ -962,6 +962,13 @@
   AllowDeferredHandleDereference convert_to_cell;
   CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateWeakCell(*value),
                      WeakCell);
+}
+
+
+Handle<TransitionArray> Factory::NewTransitionArray(int capacity) {
+  CALL_HEAP_FUNCTION(isolate(),
+                     isolate()->heap()->AllocateTransitionArray(capacity),
+                     TransitionArray);
 }