Add tests for invalid addresses and riz/eiz

	* gas/i386/inval.s: Add tests for invalid addresses and eiz.

	* gas/i386/x86-64-inval.s: Add tests for invalid addresses and
	riz/eiz.

	* gas/i386/inval.l: Updated.
	* gas/i386/x86-64-inval.l: Likewise.
Add RegRex64 to riz

	* i386-reg.tbl (riz): Add RegRex64.
	* i386-tbl.h: Regenerated.