[PATCH] D28223: clean up use of _WIN32

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists added a comment.

I like this.  A lot.

I'm a bit concerned about @smeenai 's comments about __LP64_, and @EricWF 's comment about solaris.

This patch accomplishes (or maybe just moves closer, I need to check) to a goal of mine, which is to have no references to `_WIN32` in any header files other that `<__config>` (and maybe in support/)


Repository:
  rL LLVM

https://reviews.llvm.org/D28223