[SR] Add a flag to disable copy variants (#71102)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71102
This graph pass is causing a major perf regression on some models. Ideally we would introduce maybe_copy variants for all these ops. But since those are tricky to write, I've introduced a flag to just turn the pass off for now.
ghstack-source-id: 148541673
Test Plan: `buck test caffe2/benchmarks/static_runtime:static_runtime_cpptest`
Reviewed By: navahgar
Differential Revision: D33510080
fbshipit-source-id: bb4847f26561197ea5e6bbad0a4d25db4ef468eb
(cherry picked from commit 8f333d3e8138e2a7ba04bea7509ad84dd97844eb)
