[PATCH] D49893: [asan/win] Use SRW locks to fix a race in BlockingMutex

[Reid Kleckner via Phabricator via llvm-commits]

rnk added a comment.

I'd like to try to get this in the next clang roll, since we're doing one for code coverage anyway. It'll help with https://crbug.com/783296#c57.


https://reviews.llvm.org/D49893