SHLD/SHRD - Double Precision Shift (386+ only)

	Usage:	SHLD	dest,src,count
		SHRD	dest,src,count
	Modifies flags: CF PF SF ZF (OF,AF undefined)


	SHLD shifts "dest" to the left "count" times and the bit positions
	opened are filled with the most significant bits of "src".  SHRD
	shifts "dest" to the right "count" times and the bit positions
	opened are filled with the least significant bits of the second
	operand.  Only the 5 lower bits of "count" are used.


					Clocks			Size
	Operands	 	808x  286   386   486		Bytes

	reg16,reg16,immed8	 -     -     3	   2		  4
	reg32,reg32,immed8	 -     -     3	   2		  4
	mem16,reg16,immed8	 -     -     7	   3		  6
	mem32,reg32,immed8	 -     -     7	   3		  6
	reg16,reg16,CL		 -     -     3	   3		  3
	reg32,reg32,CL		 -     -     3	   3		  3
	mem16,reg16,CL		 -     -     7	   4		  5
	mem32,reg32,CL		 -     -     7	   4		  5


	- see Instruction Timing