llvm-project

7e667c35 - [lldb] Use llvm::sys::RWMutex instead of std::shared_mutex (NFC) (#197847)

[lldb] Use llvm::sys::RWMutex instead of std::shared_mutex (NFC) (#197847) On Darwin, pthread_rwlock is faster than std::shared_mutex, which is why the implementation of llvm::sys::RWMutex used that on our platform. Everywhere else, it uses std::shared_mutex under the hood. Also see #70151 rdar://177113951