pytorch

920619dc - [PyTorch] Save a refcount bump in meta functions for addmm and mm (#59063)

[PyTorch] Save a refcount bump in meta functions for addmm and mm (#59063) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/59063 `TensorMeta::maybe_get_output()` returns `const Tensor&`, no need to copy the Tensor.. ghstack-source-id: 130044287 Test Plan: CI Reviewed By: ngimel Differential Revision: D28735225 fbshipit-source-id: f2bdf39b28de245ec4664718490e7e0b36bc8819