Fix disabling the export of noop async_drop_in_place_raw

compiler/stable_mir/src/compiler_interface.rs

@@ -158,6 +158,9 @@ pub trait Context {
     /// Check if this is an empty DropGlue shim.
     fn is_empty_drop_shim(&self, def: InstanceDef) -> bool;
 
+    /// Check if this is an empty AsyncDropGlueCtor shim.
+    fn is_empty_async_drop_ctor_shim(&self, def: InstanceDef) -> bool;
+
     /// Convert a non-generic crate item into an instance.
     /// This function will panic if the item is generic.
     fn mono_instance(&self, def_id: DefId) -> Instance;

compiler/stable_mir/src/mir/mono.rs

@@ -157,7 +157,10 @@ impl Instance {
     /// When generating code for a Drop terminator, users can ignore an empty drop glue.
     /// These shims are only needed to generate a valid Drop call done via VTable.
     pub fn is_empty_shim(&self) -> bool {
-        self.kind == InstanceKind::Shim && with(|cx| cx.is_empty_drop_shim(self.def))
+        self.kind == InstanceKind::Shim
+            && with(|cx| {
+                cx.is_empty_drop_shim(self.def) || cx.is_empty_async_drop_ctor_shim(self.def)
+            })
     }
 
     /// Try to constant evaluate the instance into a constant with the given type.