Pretenure call new support.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 00ae587d640aadcaac3e9cb5cf8be0b93dfef162..74546f5d36fc7870ded474b1da17f4784f6a1b7d 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -323,6 +323,9 @@ class Factory {
   // runtime.
   Handle<JSObject> NewJSObject(Handle<JSFunction> constructor,
                                PretenureFlag pretenure = NOT_TENURED);
+  // JSObject that should have a memento pointing to the allocation site.
+  Handle<JSObject> NewJSObjectWithMemento(Handle<JSFunction> constructor,
+                                          Handle<AllocationSite> site);
 
   // Global objects are pretenured and initialized based on a constructor.
   Handle<GlobalObject> NewGlobalObject(Handle<JSFunction> constructor);