[clang-tools-extra] [clang-tidy] add modernize-use-constexpr check (PR #146553)

[Sean McBride via cfe-commits]

seanm wrote:

> hopefully addressed all outstanding review comments

Did you have a chance to add C23 support? (And by extension Objective-C, which is what most of my code is :))

https://github.com/llvm/llvm-project/pull/146553