improve .view() performance (#30554)
Summary:
Improve .view() performance by not calling set_ and instead restriding returned alias. This improves performance of .view() operation from ~500ns to ~360 ns
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30554
Test Plan: covered by existing tests
Differential Revision: D18759896
Pulled By: ngimel
fbshipit-source-id: 9757c93158bc55e9c87dc30ac3415ba8f8b849e5
