pytorch

28339ddc - [PyTorch] Hit fused addmm path in linear() for existing MHA (#72871)

[PyTorch] Hit fused addmm path in linear() for existing MHA (#72871) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/72871 We do this same trick in the native MHA implementation; backport it for purposes of fair comparison. ghstack-source-id: 149526858 Test Plan: CI Reviewed By: ngimel Differential Revision: D34176090 fbshipit-source-id: 8b578c29c4dcf0d85bae74dfbbb82db9a8f32dc7 (cherry picked from commit fd50170935cfe790466c0eb59575ef84003b6ca6)