[PATCH] D28223: clean up use of _WIN32

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd added a comment.

I think that it will suffice for now.  We can change the flag to be more granular in the future.  I think that this is going well beyond the original intent of cleaning up the usage of the `_WIN32` macros at this point.


Repository:
  rL LLVM

https://reviews.llvm.org/D28223