[clang] [Clang] Deleting an incomplete enum type is not an error (PR #118455)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

In my case I don't see an assertion before this change (using  Clang built from c0192a008c4a2b8afdc2b63526c0483632d81c07).

https://github.com/llvm/llvm-project/pull/118455