pan/mdg: Schedule based on liveness

pan/mdg: Schedule based on liveness

By estimating liveness in the scheduler and choosing instructions likely
to reduce register pressure, on average we can decrease pressure given a
sufficiently larger window. On the other hand, decreasing pressure
instead of leaning too heavily on the search window enables us to use a
much larger search window without inflating pressure too much. So by
doing both in lockstep, we benefit pretty well.

total instructions in shared programs: 49458 -> 48540 (-1.86%)
instructions in affected programs: 26931 -> 26013 (-3.41%)
helped: 221
HURT: 15
helped stats (abs) min: 1 max: 36 x̄: 4.37 x̃: 2
helped stats (rel) min: 0.31% max: 16.90% x̄: 4.97% x̃: 3.85%
HURT stats (abs)   min: 1 max: 4 x̄: 3.13 x̃: 3
HURT stats (rel)   min: 0.50% max: 7.14% x̄: 4.53% x̃: 4.55%
95% mean confidence interval for instructions value: -4.65 -3.13
95% mean confidence interval for instructions %-change: -4.94% -3.81%
Instructions are helped.

total bundles in shared programs: 25199 -> 23446 (-6.96%)
bundles in affected programs: 21600 -> 19847 (-8.12%)
helped: 277
HURT: 170
helped stats (abs) min: 1 max: 45 x̄: 7.33 x̃: 6
helped stats (rel) min: 1.06% max: 33.83% x̄: 11.01% x̃: 8.57%
HURT stats (abs)   min: 1 max: 6 x̄: 1.63 x̃: 1
HURT stats (rel)   min: 1.19% max: 40.00% x̄: 13.36% x̃: 11.11%
95% mean confidence interval for bundles value: -4.61 -3.23
95% mean confidence interval for bundles %-change: -3.00% -0.49%
Bundles are helped.

total quadwords in shared programs: 40269 -> 39652 (-1.53%)
quadwords in affected programs: 35881 -> 35264 (-1.72%)
helped: 242
HURT: 244
helped stats (abs) min: 1 max: 36 x̄: 4.61 x̃: 3
helped stats (rel) min: 0.39% max: 16.33% x̄: 5.33% x̃: 5.13%
HURT stats (abs)   min: 1 max: 20 x̄: 2.04 x̃: 1
HURT stats (rel)   min: 0.81% max: 21.74% x̄: 7.57% x̃: 6.25%
95% mean confidence interval for quadwords value: -1.71 -0.83
95% mean confidence interval for quadwords %-change: 0.46% 1.82%
Inconclusive result (value mean confidence interval and %-change mean confidence interval disagree).

total registers in shared programs: 3786 -> 3336 (-11.89%)
registers in affected programs: 2161 -> 1711 (-20.82%)
helped: 262
HURT: 35
helped stats (abs) min: 1 max: 7 x̄: 1.87 x̃: 1
helped stats (rel) min: 6.25% max: 66.67% x̄: 28.91% x̃: 25.00%
HURT stats (abs)   min: 1 max: 3 x̄: 1.11 x̃: 1
HURT stats (rel)   min: 7.69% max: 100.00% x̄: 19.76% x̃: 12.50%
95% mean confidence interval for registers value: -1.70 -1.33
95% mean confidence interval for registers %-change: -25.56% -20.79%
Registers are helped.

total threads in shared programs: 2453 -> 2592 (5.67%)
threads in affected programs: 160 -> 299 (86.87%)
helped: 79
HURT: 6
helped stats (abs) min: 1 max: 2 x̄: 1.85 x̃: 2
helped stats (rel) min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00%
HURT stats (abs)   min: 1 max: 2 x̄: 1.17 x̃: 1
HURT stats (rel)   min: 50.00% max: 50.00% x̄: 50.00% x̃: 50.00%
95% mean confidence interval for threads value: 1.45 1.82
95% mean confidence interval for threads %-change: 81.08% 97.75%
Threads are [helped].

total spills in shared programs: 168 -> 17 (-89.88%)
spills in affected programs: 167 -> 16 (-90.42%)
helped: 13
HURT: 0

total fills in shared programs: 186 -> 35 (-81.18%)
fills in affected programs: 186 -> 35 (-81.18%)
helped: 14

HURT: 0
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5513>