message: Use DefPathBasedNames
diff: @@ -14,7 +14,10 @@ pub fn trans_mono_item<'a, 'tcx: 'a>(cx: &mut CodegenCx<'a, 'tcx, CurrentBackend
  let func_id = {
  let module = &mut cx.module;
  *cx.def_id_fn_id_map.entry(inst).or_insert_with(|| {
  - module.declare_function(&tcx.absolute_item_path_str(def_id), Linkage::Local, &sig).unwrap()
  + let def_path_based_names = ::rustc_mir::monomorphize::item::DefPathBasedNames::new(tcx, false, false);
  + let mut name = String::new();
  + def_path_based_names.push_instance_as_string(inst, &mut name);
  + module.declare_function(&name, Linkage::Local, &sig).unwrap()
  })
  };
  