[libc-commits] [libc] [libc] start fix readability-identifier-naming lints (PR #83342)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Also, `consteval` is straight up an error in `-std=c++17`: https://godbolt.org/z/TsoWEWea5

https://github.com/llvm/llvm-project/pull/83342