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

[Julian Schmidt via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/89925 at github.com>


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5chmidti wrote:

Please add testcases with a template that is not instantiated and the enum and union types are not template type parameters:
```c++
template <typename T>
struct A {
  Tags3 tag;
  Union4 val;
};
```

and tests with macros.

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