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

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