[parisc-linux] itlb miss handler optimizations!

[Carlos O'Donell]

> Thanks for that run Joel, I'll take a look at the numbers in a few
> minutes. Adding to that here is the lmbench results (urls) for both
> the non-optimized and optimized cases of the itlb fault handler.

I forgot that lamont noticed an interlocked zdep in the PA11 common case
and we reorderd the insn sequence. Perhaps this helped the numbers a
bit. I have to run the same lmbench tests on a 64-bit box first to
compare.

c.