Introduced operator variant to OpInfo (#50370)
Summary:
Introduced operator variant to OpInfo
Context: Split of https://github.com/pytorch/pytorch/issues/49158
cc mruberry
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50370
Reviewed By: mrshenli
Differential Revision: D25897821
Pulled By: mruberry
fbshipit-source-id: 4387ea10607dbd7209842b685f1794bcb31f434e
