Refactor and add VS 14.16 and 2019 CI for Windows (#33117)
Summary:
Changes according to https://github.com/pytorch/pytorch/issues/18319.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33117
Differential Revision: D19858239
Pulled By: ezyang
fbshipit-source-id: f068d8505886b92c9388c9c636eab5bd20377ceb
