6068 libdisasm: previnstr arch op should have a sane default Reviewed by: Robert Mustacchi <rm@joyent.com> Approved by: Dan McDonald <danmcd@omniti.com>

6067 libdisasm: use C99 designated initializers for arch ops Reviewed by: Robert Mustacchi <rm@joyent.com> Approved by: Dan McDonald <danmcd@omniti.com>

3317 dis(1) should support cross-target disassembly Reviewed by: Robert Mustacchi <rm@joyent.com> Reviewed by: Joshua M. Clulow <josh@sysmgr.org> Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net> Approved by: Dan McDonald <danmcd@omniti.com>