[Mesa-dev] i965 integer division/modulus v3

[Kenneth Graunke]

v.3. "This time for sure!"
I've cleaned up the series quite a bit, squashing some patches and
splitting others out to try and make it easier to review and avoid
breakage.  As such, I've dropped most of the R-b's since this series
doesn't necessarily look much like the last one.

piglit -t op-mod -t op-div now passes on Gen 4.5, 5, 6, and 7.

No regressions on Ironlake.