i965/vs: Use the sampler for VS pull constant loading on Ivybridge.
Substantially increases performance in GLBenchmark PRO: - 320x240 => 3.28x - 1920x1080 => 1.47x - 2560x1440 => 1.27x The LD message ignores the sampler unit index and SAMPLER_STATE pointer, instead relying on hard-wired default state. Thus, there's no need to worry about running out of sampler units or providing SAMPLER_STATE; this small patch should be all that's required. NOTE: This is a candidate for release branches. (It requires the preceding commit to compile.) Signed-off-by:Kenneth Graunke <kenneth@whitecape.org> Reviewed-by:
Eric Anholt <eric@anholt.net> (cherry picked from commit 259b65e2)