split_comparison_rl
split_comparison_rl(left_orig, op, right_orig, &left_true, &left_false, &right_true, &right_false);
split_comparison_rl(alloc_whole_rl(type), op, right_orig, &tmp_true, &tmp_false, NULL, NULL);
split_comparison_rl(alloc_whole_rl(type), op, right_orig, NULL, NULL, &tmp_true, &tmp_false);
void split_comparison_rl(struct range_list *left_orig, int op, struct range_list *right_orig,
split_comparison_rl(left_orig, op, right_orig, left_true_rl, left_false_rl, NULL, NULL);