[PATCH] D14731: [libcxx] Add clang thread safety annotations to mutex and lock_guard

[Eric Fiselier via cfe-commits]

EricWF added a comment.

I generated an updated patch with a sample test case (and the LIT changes needed to run it).
https://gist.github.com/EricWF/12f77078e4efc6610572


http://reviews.llvm.org/D14731