Remove stray newline.
Implement the 0x2B SUB instruction, and the OR variant of 0x81.

Found with local APIC accesses from bitrig/amd64 bsd.rd, 07/15-snap.

Reviewed by:	neel
MFC after:	3 days
Fix handling of the third argument for fcntl(2).  The native syscall
uses long for arg, which needs translation.

Discussed with and tested by:	mjg
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Regen.