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b866c14328
This test called `yield` 80,000 times, which is nothing on a system with little load, but murder on a CI system. macOS' scheduler in particular doesn't seem to deal with this very well. The `yield` calls also weren't even necessarily doing what they were meant to: if the optimizer could figure out that it doesn't clobber some memory, then it could happily reorder around the `yield`s anyway! The test has been simplified and made to work better, and the number of yields have been reduced. The number of overall iterations has also been reduced, because with the `yield` calls making races very likely, we don't really need to run too many iterations to be confident that the implementation is race-free.