folly: ThreadLocalDetail: make PthreadKeyUnregister constexpr-constructible, avoid SIOF
Summary: Since this is used in so many places during the program's static-initialization (at startup), this class itself could be (has been demonstrated to be) a point of SIOF problems itself. Made this class constexpr-constructible, so it doesn't need to be part of static initialization, making it SIOF-proof. Reviewed By: luciang Differential Revision: D2709231 fb-gh-sync-id: f248c9f2848c09045e000cfdc03636d847e522c9
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