K6 patches for review

[John Wehle]

> They looked fine to me.  Note that John Wehle had some changes to
> improve scheduling on Pentiums that needed minor updating and may
> conflict with your patch.

Actually my patch was for improving scheduling on the Pentium Pro /
Pentium II.

> I'd like to get both the Pentium improvements and your K6 stuff into
> the tree.  I don't know your schedule for benchmarking this stuff
> (presumably you'd want to do so before installing :-) and I don't
> know John's schedule for updating his patch.  So it's hard to figure
> out what to do next.

I'm about to start looking at improving the scheduling for the Pentium Pro /
Pentium II again.  Among other things I want to see if I can use the
MD_SCHED macros to teach Haifa more about scheduling for the Pentium Pro /
Pentium II.

> I also played with Haifa on my PPro a while back and was getting
> reasonable results (not great, but better than the old scheduler).
> So we might want to think about doing any necessary tuning for Haifa
> and enabling haifa by default on the x86 machines.

Yep, that's what I'm shooting for.

-- John
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