Find hip properly (#42064)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/41886
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42064
Reviewed By: seemethere
Differential Revision: D22757115
Pulled By: malfet
fbshipit-source-id: 9c8805e6eb0b7d7defe0ecb08c1e45dcc775a237
