[clang] [Clang] Fixed a crash when __PRETTY_FUNCTION__ or __FUNCSIG__ (clang-cl) appears in the trailing return type of the lambda (PR #122611)

[via cfe-commits]

TilakChad wrote:

> LGTM.
> Do you need me to merge that for you?

Thanks.

https://github.com/llvm/llvm-project/pull/122611