docs: def _get_nop_length(cls, insns):
          """
          Calculate the total size of leading nop instructions.
  
          :param insns: A list of capstone insn objects.
          :return: Number of bytes of leading nop instructions.
          :rtype: int
          """
  
          nop_length = 0
  
          if insns and cls._is_noop_insn(insns[0]):
              # see where those nop instructions terminate
              for insn in insns:
                  if cls._is_noop_insn(insn):
                      nop_length += insn.size
                  else:
                      break
  
          return nop_length