Auto merge of #2630 - RalfJung:windows-parking, r=RalfJung
Implement thread parking for Windows
Cc https://github.com/rust-lang/miri/issues/2628
Based on code by `@DrMeepster.` However I adjusted `WakeByAddressSingle`: I don't think the futex value is compared *again* after the thread is woken up. I see nothing in the Windows docs indicating such a comparison, and the Linux futex does not behave like that either. So we only check the value before sleeping, same as on Linux.
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