[clang] [Clang] Fix Itanium mangling crash for local lambda in ctor/dtor (PR #181068)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

> Could you clarify what exact mangling you think the test should check?

>From where it's crashing, I think it's the crashing computing the typeinfo of the lambda or something like that?  I haven't investigated closely enough to be sure, but the test as written doesn't seem to check the crashing mangling; it passes with TBAA/debug info disabled.

https://github.com/llvm/llvm-project/pull/181068