[clang] [clang] Fix Mame Mangling Crashes (PR #134486)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 commented:

This needs tests as well as release notes.

Also please run clang-format on the changes.

Given that @mizvekov is working on fixing unevaluated lambda contexts, I wonder if these issues could be resolved the other way around, especially since there seems to be a crash on the existing test.

https://github.com/llvm/llvm-project/pull/134486