compact_once_flag
Summary: `folly::compact_once_flag` is implemented using 1 byte. `folly::MicroLock` slot0 is used as the mutex for the slow path and slot1 is used for the stored boolean. Reviewed By: andriigrynenko Differential Revision: D25797066 fbshipit-source-id: 529de84b50e61523318a19606bc24c54f1ffa3a4
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