Opt under clang-tidy
Opt under clang-tidy

Summary: Start enabling clang-tidy. Start with an already passing check, only.

Reviewed By: justinjhendrick

Differential Revision: D19705442

fbshipit-source-id: b8e6a6c1418a9d85f671ba93f6365708c2e4eb29

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex