[libcxx-commits] [libcxx] [libc++] Simplify definition of __libcpp_recursive_mutex_t (PR #147385)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

LGTM but I'd like @mstorsjo to stamp this.

https://github.com/llvm/llvm-project/pull/147385