fix windows clang attributes (#33959)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33959
make sure clang on windows uses correct attributes.
add support for cl.exe style pragma attributes
Test Plan: CI green
Differential Revision: D20153548
fbshipit-source-id: bfbfd374e8f5e7d7b8598453c3ca2b6693a425f1
