[clang] [Clang] Add diagnostic when scoped enumeration requires an explicit conversion for binary operations (PR #152698)

[Yanzuo Liu via cfe-commits]

https://github.com/zwuis commented:

Thank you for your patch! Please add fix-it test. And please add a release note entry to `clang/docs/ReleaseNotes.rst` so that users can know the improvement.

https://github.com/llvm/llvm-project/pull/152698