[clang] [Clang] Bugfixes and improved support for `AttributedType`s in lambdas (PR #85325)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

I don't see any reason to hold this up, and its waited long enough.  So I'm going to consider this 'baked' enough in review.  

https://github.com/llvm/llvm-project/pull/85325