JCXZ/JECXZ - Jump if Register (E)CX is Zero

        Usage:  JCXZ    label
                JECXZ   label  (386+)
        Modifies flags: None

        Causes execution to branch to label if register CX is zero.  Uses
        unsigned comparision.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        label:  jump      18   8+m   9+m    8             2
                no jump    6    4     5     5


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