[clang] [Clang][Sema] Don't assert on friend declarators with an empty name (PR #223213)

[Anirudh Mathur via cfe-commits]

anirudhmathur12 wrote:

@Fznamznon @Sirraide @erichkeane Would one of you be able to take a look at this when you get a chance?

I am not very comfortable with deleting an assertion, but I couldn't think of any other solutions. Would appreciate any guidance.

https://github.com/llvm/llvm-project/pull/223213