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While here, also s/LLVM_ON_WIN32/_WIN32/ since LLVM_ON_WIN32 is going
away and _WIN32 is the same thing.

Bug: none
Change-Id: I64f813b4d4c488fbd9ff7601416e29b4b1973a10
Reviewed-on: https://chromium-review.googlesource.com/1035103
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554755}