[clang] [Clang][Sema] fix crash in codegen stage when an lambda expression declared in an unevaluated context (PR #80802)

[Qizhi Hu via cfe-commits]

jcsxky wrote:

> @jcsxky Do you have more test cases other than the one from #76674? I wonder what'll happen if constraint checking is involved.

Do you mean `concept`? If yes, I will have a try.

https://github.com/llvm/llvm-project/pull/80802