[clang] [Clang][Sema] Skip checking anonymous enum in using enum declaration (PR #87144)

[Balázs Kéri via cfe-commits]

balazske wrote:

I did not get crash with this script and latest clang. Probably there is a difference in the used system headers (`iostream` and `string` is included)?

https://github.com/llvm/llvm-project/pull/87144