Fixing error: "member may not be initialized" due to constexpr at Windows (#48836)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/48835
Fixes https://github.com/pytorch/pytorch/issues/48716
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48836
Reviewed By: malfet
Differential Revision: D25335829
Pulled By: datumbox
fbshipit-source-id: 807182e9afa3bb314dbb85bfcd9589a2c319a7db
