I'm trying to get libc++ to the point of being able to run clang-tidy. This is a PR to see if clang-tidy is happy with all the CI configs. Reviewed By: Quuxplusone, ldionne, #libc Spies: mgorny, aheejin, libcxx-commits, arichardson Differential Revision: https://reviews.llvm.org/D117174