Pretenure call new support.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index db25b09a91e7629e02c56fa1a94b07380c39b8b7..d70265c1a07d9a9923a96a30d5d297b639c3ae1c 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -326,6 +326,9 @@ 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);