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5a4fe166d1
Instead of using sleeps, have the inferior notify us (via a trap opcode) that the requested number of threads have been created. This allows us to get rid of some fairly dodgy test utility code -- wait_for_thread_count seemed like it was waiting for the threads to appear, but it never actually let the inferior run, so it only succeeded if the threads were already started when the function was called. Since the function was called after a fairly small delay (1s, usually), this is probably the reason why the tests were failing on some bots. Differential Revision: https://reviews.llvm.org/D119167