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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.