[clang] [Clang] skip shadow warnings for enum constants in distinct class scopes (PR #115656)

[Mariya Podchishchaeva via cfe-commits]

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

LGTM, in case @Sirraide and @AaronBallman don't have any further comments.

https://github.com/llvm/llvm-project/pull/115656