pan/va: Try widening small constants

pan/va: Try widening small constants

Many small integers are availabled as small constants, but the table of small
constants is tightly packed. Zero and sign extensions are usually required to
access small integers. When packing constants, try zero/sign extension for
unsigned/signed integer instructions respectively.

total instructions in shared programs: 2716912 -> 2707795 (-0.34%)
instructions in affected programs: 1045609 -> 1036492 (-0.87%)
helped: 4460
HURT: 125
helped stats (abs) min: 1.0 max: 58.0 x̄: 2.14 x̃: 1
helped stats (rel) min: 0.14% max: 23.85% x̄: 1.35% x̃: 0.88%
HURT stats (abs)   min: 1.0 max: 68.0 x̄: 3.41 x̃: 1
HURT stats (rel)   min: 0.34% max: 3.88% x̄: 0.93% x̃: 0.70%
95% mean confidence interval for instructions value: -2.09 -1.89
95% mean confidence interval for instructions %-change: -1.33% -1.25%
Instructions are helped.

total cycles in shared programs: 141984.06 -> 141932.42 (-0.04%)
cycles in affected programs: 552.08 -> 500.44 (-9.35%)
helped: 18
HURT: 0
helped stats (abs) min: 0.015625 max: 11.0 x̄: 2.87 x̃: 0
helped stats (rel) min: 0.50% max: 19.64% x̄: 5.36% x̃: 1.53%
95% mean confidence interval for cycles value: -5.17 -0.56
95% mean confidence interval for cycles %-change: -9.28% -1.44%
Cycles are helped.

total cvt in shared programs: 13805.05 -> 13663.39 (-1.03%)
cvt in affected programs: 6127.45 -> 5985.80 (-2.31%)
helped: 4460
HURT: 125
helped stats (abs) min: 0.015625 max: 0.90625 x̄: 0.03 x̃: 0
helped stats (rel) min: 0.35% max: 50.00% x̄: 5.19% x̃: 4.00%
HURT stats (abs)   min: 0.015625 max: 1.0625 x̄: 0.05 x̃: 0
HURT stats (rel)   min: 0.77% max: 9.30% x̄: 3.40% x̃: 2.78%
95% mean confidence interval for cvt value: -0.03 -0.03
95% mean confidence interval for cvt %-change: -5.10% -4.81%
Cvt are helped.

total ls in shared programs: 129545 -> 129494 (-0.04%)
ls in affected programs: 495 -> 444 (-10.30%)
helped: 6
HURT: 0
helped stats (abs) min: 2.0 max: 11.0 x̄: 8.50 x̃: 11
helped stats (rel) min: 1.49% max: 19.64% x̄: 13.95% x̃: 19.64%
95% mean confidence interval for ls value: -12.68 -4.32
95% mean confidence interval for ls %-change: -23.23% -4.67%
Ls are helped.

total quadwords in shared programs: 1476416 -> 1469824 (-0.45%)
quadwords in affected programs: 121208 -> 114616 (-5.44%)
helped: 820
HURT: 16
helped stats (abs) min: 8.0 max: 32.0 x̄: 8.28 x̃: 8
helped stats (rel) min: 1.39% max: 50.00% x̄: 11.00% x̃: 10.00%
HURT stats (abs)   min: 8.0 max: 32.0 x̄: 12.50 x̃: 8
HURT stats (rel)   min: 1.38% max: 10.00% x̄: 6.19% x̃: 7.14%
95% mean confidence interval for quadwords value: -8.14 -7.63
95% mean confidence interval for quadwords %-change: -11.20% -10.15%
Quadwords are helped.

total threads in shared programs: 53633 -> 53663 (0.06%)
threads in affected programs: 39 -> 69 (76.92%)
helped: 33
HURT: 3
helped stats (abs) min: 1.0 max: 1.0 x̄: 1.00 x̃: 1
helped stats (rel) min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00%
HURT stats (abs)   min: 1.0 max: 1.0 x̄: 1.00 x̃: 1
HURT stats (rel)   min: 50.00% max: 50.00% x̄: 50.00% x̃: 50.00%
95% mean confidence interval for threads value: 0.64 1.02
95% mean confidence interval for threads %-change: 73.27% 101.73%
Threads are helped.

total spills in shared programs: 154 -> 103 (-33.12%)
spills in affected programs: 75 -> 24 (-68.00%)
helped: 6
HURT: 0

total fills in shared programs: 656 -> 656 (0.00%)
fills in affected programs: 148 -> 148 (0.00%)
helped: 2
HURT: 4

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16862>