[libcxx-commits] [clang] [libcxx] [clang][ThreadSafety] Handle mutex scope (PR #157171)

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PiJoules wrote:

> > LGTM and can confirm this fixes #156760. Could you add that repro as a regression test here.
> 
> Can you check if the regression tests added to `clang/test/PCH/thread-safety-attrs.cpp` covers the cases?

That test passes mutexes to std::lock but the example in the bug has unique_locks passed to std::lock

https://github.com/llvm/llvm-project/pull/157171