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ed1253ab90
There was a whole bunch of ref counting churn coming from Mutex, which had a RefPtr<Thread> m_holder to (mostly) point at the thread holding the mutex. Since we never actually dereference the m_holder value, but only use it for identity checks against thread pointers, we can store it as an uintptr_t and skip the ref counting entirely. Threads can't die while holding a mutex anyway, so there's no risk of them going missing on us.