OpInfo: tril, triu (#59145)
Summary:
Reference: https://github.com/pytorch/pytorch/issues/54261
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59145
Reviewed By: ngimel
Differential Revision: D28776433
Pulled By: mruberry
fbshipit-source-id: 2ff11a5202af1e73ffc2b242035c990646bd2259
