Sets device guard in _cudnn_impl functions (#70406)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/70404
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70406
Reviewed By: mruberry
Differential Revision: D33407972
Pulled By: ngimel
fbshipit-source-id: 6bf97602ea13f8eaaff95d9f412a2eeaa0e6ba10
