preprocessor cleanup (#33957)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33957
lots of small preprocessor warning cleanup for windows
Test Plan: CI green
Reviewed By: malfet, albanD
Differential Revision: D20153582
fbshipit-source-id: 18fd61c466fd1f55ededdae4448b3009a9cedc04
