Method patch

java/com/google/re2j/Prog.java:125–136

(int l, int val)

  }

  void patch(int l, int val) {
    while (l != 0) {
      Inst i = inst[l >> 1];
      if ((l & 1) == 0) {
        l = i.out;
        i.out = val;
      } else {
        l = i.arg;
        i.arg = val;
      }
    }
  }

  int append(int l1, int l2) {
    if (l1 == 0) {