ARPL - Adjusted Requested Privilege Level of Selector (286+ PM)

        Usage:  ARPL    dest,src
        (286+ protected mode)
        Modifies flags: ZF

        Compares the RPL bits of dest against src.  If the RPL bits
        of dest are less than src, the destination RPL bits are set
        equal to the source RPL bits and the Zero Flag is set.  Otherwise
        the Zero Flag is cleared.

                                Clocks                  Size
        Operands         808x  286   386   486          Bytes

        reg,reg           -     10    20    9             2
        mem,reg           -     11    21    9             4

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