Avoid unnecessary ping-pong in portable test semaphore wakeup
Summary: [Folly] Avoid unnecessary ping-pong in portable test semaphore wakeup when `wait()` is called without callback arguments. Reviewed By: nbronson Differential Revision: D15903121 fbshipit-source-id: c40018bbd0c49f5114a340a9b97c8cc9f8f70a7c
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