Fix decoding of MOVSX.

Submitted by:	Wolf Ramovsky <wolf.ramovsky gmail.com>
		via core (peter)
MFC after:	2 weeks
Fix decoding of LEA when address-size prefix (67h) is present.

This is loosly based on Xorg changeset f57bc0e by Christian
Zander.

Submitted by:	Wolf Ramovsky <wolf.ramovsky gmail.com>
		via core (peter)
MFC after:	2 weeks
Fix decoding of near CALL when address-size prefix (67h) is present.

Submitted by:	Wolf Ramovsky <wolf.ramovsky gmail.com>
		via core (peter)
MFC after:	2 weeks