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

[Congcong Cai via cfe-commits]

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


https://github.com/HerrCai0907 approved this pull request.

In general LGTM.
Please fix some nits

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