remove unused func (#18712)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18712
ghimport-source-id: e435150a501b20695a5276addee93d795e04b532
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#18712 [jit][easy] remove unused func**
* #18711 [jit] fix side-effects and aliasing for custom ops
as title
Differential Revision: D14730979
fbshipit-source-id: 381d16ea2a45779bf6d5fc6d90a4f8585461e902
