Stop using a special inner body for the coroutine by-move body for async closures

compiler/rustc_monomorphize/src/collector.rs

@@ -920,7 +920,6 @@ fn visit_instance_use<'tcx>(
         | ty::InstanceKind::ReifyShim(..)
         | ty::InstanceKind::ClosureOnceShim { .. }
         | ty::InstanceKind::ConstructCoroutineInClosureShim { .. }
-        | ty::InstanceKind::CoroutineKindShim { .. }
         | ty::InstanceKind::Item(..)
         | ty::InstanceKind::FnPtrShim(..)
         | ty::InstanceKind::CloneShim(..)

compiler/rustc_monomorphize/src/partitioning.rs

@@ -626,7 +626,6 @@ fn characteristic_def_id_of_mono_item<'tcx>(
                 | ty::InstanceKind::FnPtrShim(..)
                 | ty::InstanceKind::ClosureOnceShim { .. }
                 | ty::InstanceKind::ConstructCoroutineInClosureShim { .. }
-                | ty::InstanceKind::CoroutineKindShim { .. }
                 | ty::InstanceKind::Intrinsic(..)
                 | ty::InstanceKind::DropGlue(..)
                 | ty::InstanceKind::Virtual(..)
@@ -796,7 +795,6 @@ fn mono_item_visibility<'tcx>(
         | InstanceKind::Intrinsic(..)
         | InstanceKind::ClosureOnceShim { .. }
         | InstanceKind::ConstructCoroutineInClosureShim { .. }
-        | InstanceKind::CoroutineKindShim { .. }
         | InstanceKind::DropGlue(..)
         | InstanceKind::AsyncDropGlueCtorShim(..)
         | InstanceKind::CloneShim(..)

compiler/rustc_monomorphize/src/polymorphize.rs

@@ -127,7 +127,7 @@ fn mark_used_by_default_parameters<'tcx>(
     unused_parameters: &mut UnusedGenericParams,
 ) {
     match tcx.def_kind(def_id) {
-        DefKind::Closure => {
+        DefKind::Closure | DefKind::SyntheticCoroutineBody => {
             for param in &generics.own_params {
                 debug!(?param, "(closure/gen)");
                 unused_parameters.mark_used(param.index);