silence unreachable code warnings (#15036)
Summary:
Stack:
:black_circle: **#15036 silence unreachable code warnings** [:yellow_heart:](https://our.intern.facebook.com/intern/diff/D13411100/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15036
Differential Revision: D13414712
Pulled By: li-roy
fbshipit-source-id: d4aa84571fa94c66f3c5bfa9575a10c6ee398f9e
