collatzGlideHost

uint32_t collatzGlide(const mp::cpp_int& original){
  uint32_t step = 0;
  mp::cpp_int val = original;
  while (true){
    if ((val & 1u) == 0){
      //val is even
      val >>= 1;
      ++step ;
      if (val < original) {
        break;
      }
    }else{
      //val is odd
      val += (val + 1) >> 1;
      step += 2;
    }
  } //while()
  return step;
}