[clang] [clang] Fix crash when declaring invalid lambda member (PR #74110)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @AaronBallman Thanks for the review. Sorry for responding so late - I've missed your review.
> 
> The tests aren't actually unrelated to the path. This is the file where I discovered the crash, so I just used it to demonstrate that it's fixed. I'm not sure how to split things, since I can't add the run line without fixing the bug.

Ah, I see now what's going on, and yeah, the tests are not unrelated to the patch (the added RUN line is what causes the crash today), sorry for missing that.

https://github.com/llvm/llvm-project/pull/74110