if (succeeded(state.Union(member_id, user_member_id, policies)))
        clustered = true;
    }
  }

  return clustered;
}

llvm::SmallVector<Cluster> FindClustersInTheBlock(
    Block *block, const ClusteringPolicySet &policies,
    std::function<bool(Operation *op)> filter) {
  // It is impossible to build a cluster in the empty block.
  if (block->empty()) return {};