message: Make hash_result an Option.
diff: @@ -224,7 +224,7 @@ pub(crate) fn run_aot(
  tcx,
  (backend_config.clone(), cgu.name()),
  module_codegen,
  - rustc_middle::dep_graph::hash_result,
  + Some(rustc_middle::dep_graph::hash_result),
  );
  if let Some((id, product)) = work_product {
  