Rollup merge of #123368 - maurer:cfi-non-general-coroutines, r=compiler-errors

CFI: Support non-general coroutines

Previously, we assumed all `ty::Coroutine` were general coroutines and attempted to generalize them through the `Coroutine` trait. Select appropriate traits for each kind of coroutine.

I have this marked as a draft because it currently only fixes async coroutines, and I think it make sense to try to fix gen/async gen coroutines before this is merged.

If the issue [mentioned](https://github.com/rust-lang/rust/pull/123106#issuecomment-2030794213) in the original PR is actually affecting someone, we can land this as is to remedy it.