[clang-tools-extra] [clang-tidy] Fix bugprone-tagged-union-member-count false-positive (PR #135831)

[Baranov Victor via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/135831 at github.com>


vbvictor wrote:

I'm not sure if we need to check explicitly if some `struct`/`enum` comes from `std` since all `std` namespace is already placed in system headers unless some niece cases like `std::hash<>`. I'm okay leaving it as is, but please then add test with `std` namespace because now only system headers are tested.

https://github.com/llvm/llvm-project/pull/135831