Auto merge of #2631 - RalfJung:futex-wait-no-isolate, r=RalfJung

Support timeouts with monotonic clocks even when isolation is enabled

With the deterministic monotonic clock support we now have, we can allow some synchronization primitives with timeouts even under isolation:
- Linux futex waiting (when set to the monotonic clock)
- pthread_cond_timedwait (when set to the monotonic clock)
- Windows WaitOnAddress

Unfortunately none of these exist on macOS -- the standard library always uses the system clock for timeouts on macOS, so that will still require `-Zmiri-disable-isolation`.

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