Optimise waitgroup #17
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To avoid doing wasteful computation, I introduce a yieldThreadState and a blockThreadState. Both of this achieve the same thing except that yieldThread times out the thread while blockThread blocks the thread. This signals two different things to the deadlock detector to avoid false positives.
This also speeds up the standard library implementation of the WaitGroup since we no longer pointlessly iterate until the TimeQuanta for the thread reaches 0.