//     ADUFFxxx $offset
		// becomes
		//     $MOV runtime.duffxxx@GOT, $reg
		//     $LEA $offset($reg), $reg
		//     CALL $reg
		// (we use LEAx rather than ADDx because ADDx clobbers
		// flags and duffzero on 386 does not otherwise do so).
		var sym *obj.LSym
		if p.As == obj.ADUFFZERO {
			sym = ctxt.LookupABI("runtime.duffzero", obj.ABIInternal)
		} else {