Gallium can leave const buffers bound above what is used by the current
shader. Which can have a couple bad effects:
1) write beyond const space assigned, which can trigger HLSQ lockup
2) double emit of immed consts, first with bound const buffer vals
followed by with actual immed vals. This seems to be a sort of
undefined condition.
Signed-off-by: Rob Clark <robclark@freedesktop.org>
Rob Clark
98c1111462