// enable interesting optimizations by themselves.
    int effective_cluster_size =
        (node->IsIdentity() || node->IsConstant()) ? 0 : 1;

    bool has_functional_control_flow = node->IsWhileNode() || node->IsIfNode();

    std::optional<DeadnessPredicate> deadness_predicate;
    if (deadness_analysis_) {
      TF_ASSIGN_OR_RETURN(
          deadness_predicate,