SideEffectAnalysisInfo child_analysis(
            &child_region, op_side_effect_collector_, alias_analysis_,
            op_to_parallel_ids_);
        // Move data from `child_analysis` to current region.
        for (auto& entry : child_analysis.control_predecessors_)
          control_predecessors_[entry.first] = std::move(entry.second);
        for (auto& entry : child_analysis.op_to_resource_ids_)