[clang] [compiler-rt] [ubsan] Improve scoped enum diagnostic printer (PR #216460)

[via llvm-commits]

zebullax wrote:

> Thanks you for this improvements.
> 
> > I could not find a good reason for this to be the case
> 
> It does not look like a good description, please try to explain root cause the issue.

Sorry I meant, a good reason to keep it as is, I will update the description to explain the *why* and the other comments.
Thanks

https://github.com/llvm/llvm-project/pull/216460