amd64 - invitation to test

[Jordan Gordeev]

It's time public testing of the amd64 port begins.

The code is available in my git repo at 
git://leaf.dragonflybsd.org/~smtms/dragonfly.git in branches "amd64" and 
"amd64+hacks".
The "amd64+hacks" branch contains what "amd64" contains + some band aid 
to keep the system working even when a proper fix to a known problem is 
not yet developed.

You can now begin to find and report (and fix) bugs.

Here are some known issues, that should not be reported:
- SMP does not work.
- vkernels do not work
- 32-bit apps do not work
- processes hang in state "umtxsl"
- loader compiled by amd64 cross-buildworld doesn't work. use i386 loader.
- CPU time used by processes is charged as 100% user time.
- there's no support for analyzing amd64 kernel core dumps yet.