[clang-tools-extra] [clang-tidy] Add new check bugprone-tagged-union-member-count (PR #89925)

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@@ -132,11 +157,11 @@ size_t TaggedUnionMemberCountCheck::getNumberOfValidEnumValues(
   // 3. The value of the counting enum constant is the largest out of every enum
   //    constant.
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tigbr wrote:

I agree that this part was overcomplicated. I changed it to just checking the name and the value of the last enum constant.

https://github.com/llvm/llvm-project/pull/89925