[MLton] PowerPC/AIX working

[Matthew Fluet]

Ville Laurikari wrote:
> I'm happy to report that after Matthew's latest patch trunk works
> again on AIX/PowerPC, and all regression tests pass.

Great!  It would be nice to do proper RSSA and Machine IL type-checking 
on big-endian systems, but since that is mainly useful for development 
(and development main happens on little-endian {x66,amd64}-linux), its 
not too great a loss.

> Next I'll see if I can get HPUX/parisc and HPUX/ia64 working as
> well...

That would be very nice.