Move `SanityCheck` and `MirPass` They are currently in `rustc_middle`. This PR moves them to `rustc_mir_transform`, which makes more sense. r? ``@cjgillot``
Move `SanityCheck` and `MirPass` They are currently in `rustc_middle`. This PR moves them to `rustc_mir_transform`, which makes more sense. r? ``@cjgillot``