[PyTorch] Add c10::MaybeOwned and Tensor::expect_contiguous (#53317)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53317
This seems like it might help in cases where we have to call
`Tensor::contiguous`, but we expect that the tensor in question will
be contiguous a good portion of the time.
ghstack-source-id: 123203771
Test Plan:
Profiled AdIndexer on inline_cvr; time spent in
clip_ranges_gather_sigrid_hash_each_feature<int> was cut in half from
1.37% to 0.66%
Reviewed By: smessmer
Differential Revision: D26738036
fbshipit-source-id: b5db10783ccd103dae0ab3e79338a83b5e507ebb
