message: Shrink vtable symbol names a bit
diff: @@ -135,7 +135,14 @@ fn build_vtable<'tcx>(
  let data_id = fx
  .module
  .declare_data(
  - &format!("vtable.{:?}.for.{:?}", trait_ref, layout.ty),
  + &format!(
  + "__vtable.{}.for.{:?}",
  + trait_ref
  + .as_ref()
  + .map(|trait_ref| format!("{:?}", trait_ref.skip_binder()).into())
  + .unwrap_or(std::borrow::Cow::Borrowed("???")),
  + layout.ty
  + ),
  Linkage::Local,
  false,
  false,
  