[PyTorch] Reapply D27404164: Devirtualize is_contiguous (#55333)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55333
Reapplying without using enum class in a bitfield. See new
comments about gcc bug.
ghstack-source-id: 125776904
Test Plan: Carefully review OSS test failure logs this time
Reviewed By: kimishpatel, bhosmer
Differential Revision: D27576623
fbshipit-source-id: 68fb00e5ff5215e56c8b9bc02717e1e7b2fedf9b
