plan9/amd64 on pc64 9front kernel, made go tool work

[Aram Hăvărneanu]

Today I had some free time so I started working on making the amd64

port work on the new 64-bit 9front kernel. Things are pretty shaky

now, but I made it to the point where the Go tool works and compiles

everything.

If anyone wants to try out, or help, provisional repository here:

    hg clone https://code.google.com/r/aram-goplan9/

I'd like people to test this on nix (9atom) and 386 as well, maybe

I broke something.