Porting MDB

For more information contact MatthewAhrens or DanielLovasko.

Reference mdb source: https://github.com/illumos/illumos-gate/tree/master/usr/src/cmd/mdb

Reference FreeBSD version: 10.0-RELEASE

1. Support FreeBSD core files on illumos
2. Get mdb to compile on FreeBSD
3. Support FreeBSD crash dumps

• A proof of concept support for FreeBSD registers. This might also lead to an interesting ABI abstraction layer in order to support more systems.