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bd841111f3
This adds a new helper that can be called from application code to ensure that no mutexes are held on specific code paths. This is useful for multiple scenarios, including ensuring no locks are held: - at thread exit - in peformance-critical code - when a coroutine is suspended (can cause deadlocks) See this discourse thread for more discussion: https://discourse.llvm.org/t/add-threadsanitizer-check-to-prevent-coroutine-suspending-while-holding-a-lock-potential-deadlock/74051