Optimize dedupe region ancestor tracking (#152589)
Summary:
X-link: https://github.com/pytorch/pytorch/pull/152589
Approved by: https://github.com/anijain2305
ghstack dependencies: #152389, #152505, #152410, #152506, #152570, #152572
Reviewed By: jeanschmidt
Differential Revision: D74668984
fbshipit-source-id: cdb0ee61902bcde560b369fc065ab5b4d76e6157
