[libcxx-commits] [libcxx] [libc++] Add thread safety annotations for std::lock (PR #154078)

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llvmbot wrote:

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Failed to cherry-pick: 0a2eb850d0dbd9caa1b22ee94f3b2b9903f679cb

https://github.com/llvm/llvm-project/actions/runs/17425303760

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/154078