message: Turn tcx.vtable_allocation() into a query.
diff: @@ -68,7 +68,7 @@ pub(crate) fn get_vtable<'tcx>(
  ty: Ty<'tcx>,
  trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>,
  ) -> Value {
  - let alloc_id = fx.tcx.vtable_allocation(ty, trait_ref);
  + let alloc_id = fx.tcx.vtable_allocation((ty, trait_ref));
  let data_id =
  data_id_for_alloc_id(&mut fx.constants_cx, &mut *fx.module, alloc_id, Mutability::Not);
  let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
  