move CallOnce to synchronization/
Summary: as above Reviewed By: knekritz Differential Revision: D6088687 fbshipit-source-id: 0efbb7f5fa33b5f553c0c2019658370fc6e8613f
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Summary: as above Reviewed By: knekritz Differential Revision: D6088687 fbshipit-source-id: 0efbb7f5fa33b5f553c0c2019658370fc6e8613f