[clang-tidy] fix compilation by disambiguating equality operator

This fixes a compilation issue on Ubuntu 22.04 with the Ubuntu
provided Clang 14 and C++20. That's probably happening due to
incomplete C++20 support in either Clang 14 or the GNU libstdc++ 12.

Signed-off-by: Gregor Jasny <[email protected]>

Author: gjasny

clang-tools-extra/clang-tidy/bugprone/TaggedUnionMemberCountCheck.cpp

@@ -144,7 +144,9 @@ TaggedUnionMemberCountCheck::getNumberOfEnumValues(const EnumDecl *ED) {
 
   if (EnableCountingEnumHeuristic && LastEnumConstant &&
       isCountingEnumLikeName(LastEnumConstant->getName()) &&
-      (LastEnumConstant->getInitVal() == (EnumValues.size() - 1))) {
+      llvm::APSInt::compareValues(LastEnumConstant->getInitVal(),
+                                  llvm::APSInt::get(EnumValues.size() - 1)) ==
+          0) {
     return {EnumValues.size() - 1, LastEnumConstant};
   }