pan/bi: Specialize IDVS in NIR

pan/bi: Specialize IDVS in NIR

It's a bit more code, but it's needed to chew through control flow since we
don't have a backend version of dead_cf. Results are really good, meaning I
really screwed this up the first time around (hence the cc mesa-stable).

total instructions in shared programs: 1963576 -> 1939513 (-1.23%)
instructions in affected programs: 671053 -> 646990 (-3.59%)
helped: 4436
HURT: 729
helped stats (abs) min: 1.0 max: 43.0 x̄: 5.75 x̃: 6
helped stats (rel) min: 0.21% max: 100.00% x̄: 6.47% x̃: 5.17%
HURT stats (abs)   min: 1.0 max: 22.0 x̄: 2.01 x̃: 1
HURT stats (rel)   min: 0.50% max: 50.00% x̄: 10.45% x̃: 9.09%
95% mean confidence interval for instructions value: -4.77 -4.55
95% mean confidence interval for instructions %-change: -4.36% -3.80%
Instructions are helped.

total tuples in shared programs: 1533335 -> 1523194 (-0.66%)
tuples in affected programs: 483167 -> 473026 (-2.10%)
helped: 3414
HURT: 1288
helped stats (abs) min: 1.0 max: 20.0 x̄: 3.73 x̃: 2
helped stats (rel) min: 0.27% max: 100.00% x̄: 4.87% x̃: 3.03%
HURT stats (abs)   min: 1.0 max: 19.0 x̄: 2.02 x̃: 1
HURT stats (rel)   min: 0.24% max: 38.10% x̄: 8.10% x̃: 5.88%
95% mean confidence interval for tuples value: -2.28 -2.03
95% mean confidence interval for tuples %-change: -1.62% -1.02%
Tuples are helped.

total clauses in shared programs: 351432 -> 329158 (-6.34%)
clauses in affected programs: 142237 -> 119963 (-15.66%)
helped: 5328
HURT: 3
helped stats (abs) min: 1.0 max: 43.0 x̄: 4.18 x̃: 4
helped stats (rel) min: 0.74% max: 100.00% x̄: 19.44% x̃: 17.24%
HURT stats (abs)   min: 1.0 max: 1.0 x̄: 1.00 x̃: 1
HURT stats (rel)   min: 9.09% max: 12.50% x̄: 10.90% x̃: 11.11%
95% mean confidence interval for clauses value: -4.25 -4.11
95% mean confidence interval for clauses %-change: -19.72% -19.12%
Clauses are helped.

total cycles in shared programs: 202830.92 -> 172084.50 (-15.16%)
cycles in affected programs: 117078.42 -> 86332 (-26.26%)
helped: 5450
HURT: 1
helped stats (abs) min: 0.083333 max: 49.0 x̄: 5.64 x̃: 5
helped stats (rel) min: 1.42% max: 100.00% x̄: 27.94% x̃: 25.64%
HURT stats (abs)   min: 0.25 max: 0.25 x̄: 0.25 x̃: 0
HURT stats (rel)   min: 2.46% max: 2.46% x̄: 2.46% x̃: 2.46%
95% mean confidence interval for cycles value: -5.74 -5.54
95% mean confidence interval for cycles %-change: -28.30% -27.58%
Cycles are helped.

total arith in shared programs: 57274.29 -> 57145.04 (-0.23%)
arith in affected programs: 16418.33 -> 16289.08 (-0.79%)
helped: 2442
HURT: 1784
helped stats (abs) min: 0.041665999999999315 max: 0.75 x̄: 0.14 x̃: 0
helped stats (rel) min: 0.23% max: 100.00% x̄: 5.51% x̃: 2.87%
HURT stats (abs)   min: 0.041665999999999315 max: 0.9166670000000003 x̄: 0.12 x̃: 0
HURT stats (rel)   min: 0.00% max: 100.00% x̄: 25.13% x̃: 9.09%
95% mean confidence interval for arith value: -0.04 -0.03
95% mean confidence interval for arith %-change: 6.61% 8.24%
Inconclusive result (value mean confidence interval and %-change mean confidence interval disagree).

total texture in shared programs: 12857 -> 12857 (0.00%)
texture in affected programs: 0 -> 0
helped: 0
HURT: 0

total vary in shared programs: 11157.75 -> 11157.75 (0.00%)
vary in affected programs: 0 -> 0
helped: 0
HURT: 0

total ldst in shared programs: 177208 -> 146420 (-17.37%)
ldst in affected programs: 117098 -> 86310 (-26.29%)
helped: 5447
HURT: 0
helped stats (abs) min: 1.0 max: 49.0 x̄: 5.65 x̃: 5
helped stats (rel) min: 1.92% max: 100.00% x̄: 27.91% x̃: 25.64%
95% mean confidence interval for ldst value: -5.75 -5.55
95% mean confidence interval for ldst %-change: -28.27% -27.56%
Ldst are helped.

total quadwords in shared programs: 1436507 -> 1398329 (-2.66%)
quadwords in affected programs: 515101 -> 476923 (-7.41%)
helped: 5150
HURT: 111
helped stats (abs) min: 1.0 max: 39.0 x̄: 7.46 x̃: 6
helped stats (rel) min: 0.17% max: 100.00% x̄: 10.02% x̃: 8.24%
HURT stats (abs)   min: 1.0 max: 9.0 x̄: 2.01 x̃: 1
HURT stats (rel)   min: 0.43% max: 21.62% x̄: 3.57% x̃: 1.94%
95% mean confidence interval for quadwords value: -7.41 -7.11
95% mean confidence interval for quadwords %-change: -9.98% -9.49%
Quadwords are helped.

total threads in shared programs: 35025 -> 35228 (0.58%)
threads in affected programs: 218 -> 421 (93.12%)
helped: 208
HURT: 5
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: 0.91 0.99
95% mean confidence interval for threads %-change: 93.40% 99.55%
Threads are helped.

total loops in shared programs: 128 -> 125 (-2.34%)
loops in affected programs: 3 -> 0
helped: 3
HURT: 0
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%

total spills in shared programs: 158 -> 149 (-5.70%)
spills in affected programs: 15 -> 6 (-60.00%)
helped: 9
HURT: 0

total fills in shared programs: 1133 -> 966 (-14.74%)
fills in affected programs: 197 -> 30 (-84.77%)
helped: 9
HURT: 0

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15090>