Method has_loop_condition

common/expr.h:779–781

  ABSL_MUST_USE_RESULT std::unique_ptr<Expr> release_accu_init();

  ABSL_MUST_USE_RESULT bool has_loop_condition() const {
    return loop_condition_ != nullptr;
  }

  ABSL_MUST_USE_RESULT const Expr& loop_condition() const
      ABSL_ATTRIBUTE_LIFETIME_BOUND;