Fix constexpr predicate names
Fix constexpr predicate names

Summary: [Folly] Fix `constexpr` predicate names, which have embarrassing typos.

Reviewed By: igorsugak

Differential Revision: D7605352

fbshipit-source-id: e04a87fd375f09472b020380bf446c7236a39e51

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly