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

[Zeyi Xu via cfe-commits]

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@@ -125,11 +125,38 @@ void SignedCharMisuseCheck::registerMatchers(MatchFinder *Finder) {
           .bind("arraySubscript");
 
   Finder->addMatcher(STDArraySubscript, this);
+
+  // Catch signed char values passed to a <cctype>/<ctype.h> classification
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zeyi2 wrote:

IMO the comment is overly verbose, could you make it more concise?

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