Fix TSAN-report racing access to checkedDiskForMmap_ and forceMmapOff_#9685

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riversand963 wants to merge 1 commit intofacebook:mainfrom riversand963:export-D34780308

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Commits on Mar 18, 2022

Fix race condition caused by concurrent accesses to forceMmapOff_ when opening Posix WritableFile (facebook#9685 )

riversand963
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facebook-github-bot
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