[clang-tools-extra] [clang-tidy] Catch <cctype> function args in bugprone-signed-char-misuse (PR #211403)

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cavdarahmet wrote:

Thanks for the reminder and for taking the time to review my PR.

I used AI only during the initial exploration phase, such as understanding the relevant parts of the LLVM codebase and reviewing reference documentation related to this change. The implementation, testing, and final code were written and verified by me.

If you have any further comments or requested changes, I'd be happy to address them.


https://github.com/llvm/llvm-project/pull/211403