Make add_relu an internal function (#46676)
Summary:
Cleanup for 1.7
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46676
Reviewed By: gchanan
Differential Revision: D24458565
Pulled By: albanD
fbshipit-source-id: b1e4b4630233d3f1a4bac20e3077411d1ae17f7b
