message: Use stable sort
diff: @@ -142,7 +142,7 @@ struct lbvh_builder
  );
  }
  - std::sort(prim_refs.begin(), prim_refs.end());
  + std::stable_sort(prim_refs.begin(), prim_refs.end());
  return { 0, static_cast<int>(last - first), scene_bounds };
  }
  