rshift use default >> operator (#40545)
Summary:
Fix https://github.com/pytorch/pytorch/issues/40032
Also see https://github.com/pytorch/pytorch/pull/35339
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40545
Reviewed By: pbelevich
Differential Revision: D22362816
Pulled By: ngimel
fbshipit-source-id: 4bbf9212b21a4158badbfee8146b3b67e94d5a33
