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vm: fix race condition in watchdog cleanup
Previous code was calling uv_loop_delete() directly on a running loop, which led to race condition aborts/segfaults within libuv. This change changes the watchdog thread to call uv_run() with UV_RUN_ONCE so that the call exits after either the timer times out or uv_async_send() is called from the main thread in Watchdog::Destroy(). The timer/async handles are then closed and uv_run() with UV_RUN_DEFAULT is called so that libuv has a chance to cleanup before the thread exits. The main thread meanwhile calls uv_thread_join() and then uv_loop_delete() to complete the cleanup.
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