Adding `wait_while` to the loom Condvar. #167

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johnhurt wants to merge 2 commits intotokio-rs:masterfrom RookAndPawn:add-condvar-wait-while

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Commits on Aug 26, 2020

Adding wait_while to the loom Condvar. This is just some logic combined with the existing wait, so I lifted the wait_while function body straight from the rust implementation
johnhurt
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Oops, forgot to run fmt
johnhurt
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