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

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=?utf-8?b?R8OhYm9yIFTDs3RodsOhcmk=?= <tigbrcode at protonmail.com>,
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/89925 at github.com>


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tigbr wrote:

A @isuckatcs specifically requested [testing C and Objective-C or specifying in the check that those languages are not supported](https://github.com/llvm/llvm-project/pull/89925#discussion_r1578557769).

> The default config is `-std=c++11-or-later`, but this check is not limited to that only, so we want to run it with `-std=c++98-or-later`.
> 
> The check also supports C and Objective-C, so please add `.c` and `.m` test files and create tests for those languages too.
> 
> If you don't want to support any of these languages, please add `bool isLanguageVersionSupported(const LangOptions &LangOpts) const override;` to your check and configure the supported languages.

C-style tagged unions are supported in Objective-C and Objective-C++ so why exclude these languages? If we support them, then they should be tested.


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