ben-manes / caffeine / #5363

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Fix TimerWheel zero-boundary handling and async expiration delay

Fix advance() to correctly expire timers when nanoTime() crosses from
negative to zero by using separate variables for delta computation
(compensated) and bucket scanning (raw), and changing the compensation
condition from > 0 to >= 0. Fix expire() to clamp delta in long space
before narrowing to int, preventing silent no-op on large deltas. Fix
getExpirationDelay() to clamp async computing entries' negative age to
zero, preventing ~220-year scheduler delays (aedile#49).

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