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

[Nikolas Klauser via cfe-commits]

philnik777 wrote:

> The tests changes look mostly unrelated to this PR

They mostly are. I found this while trying to check C++03 with the test and noticed that C++11 also crashes, so I updated the test to also run in C++11.

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