[clang] nolock/noalloc attributes (PR #84983)

[via cfe-commits]

Sirraide wrote:

> * the bug where `AttributedType` sugar gets lost on lambdas (when the "inferred" return type gets converted to a concrete one) happens here and the `nolock(false)` attribute is lost from `h`.

Opened an issue for this (#85120) because it really does seem like a bug to me.

https://github.com/llvm/llvm-project/pull/84983