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

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+.. title:: clang-tidy - bugprone-tagged-union-member-count
+
+==================================
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whisperity wrote:

(AFAIK this line is not needed and not used in other documentation files.)
```suggestion
```

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