Optimizing out the division in the fusion
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/23275
Test Plan: Imported from OSS
Differential Revision: D16450294
Pulled By: zafartahirov
fbshipit-source-id: 2f1ebf3673ed0467a9f6a912e08e5d95f9b27d0b
