pan/bi: Don't use the broken idiv lowering

pan/bi: Don't use the broken idiv lowering

Rip off the band-aid. We can't tolerate straight-up wrong results, after all.
Addresses the Bifrost/Valhall portion of #6555.

Fixes test_integer_ops uint_math / subcase.

total instructions in shared programs: 2674840 -> 2734512 (2.23%)
instructions in affected programs: 189964 -> 249636 (31.41%)
helped: 0
HURT: 383
HURT stats (abs)   min: 8.0 max: 184.0 x̄: 155.80 x̃: 173
HURT stats (rel)   min: 1.85% max: 126.09% x̄: 32.38% x̃: 34.46%
95% mean confidence interval for instructions value: 150.98 160.63
95% mean confidence interval for instructions %-change: 31.27% 33.48%
Instructions are HURT.

total cycles in shared programs: 140627.36 -> 140629.05 (<.01%)
cycles in affected programs: 24.81 -> 26.50 (6.80%)
helped: 0
HURT: 4
HURT stats (abs)   min: 0.1875 max: 0.9375 x̄: 0.42 x̃: 0
HURT stats (rel)   min: 2.52% max: 37.50% x̄: 13.26% x̃: 6.52%
95% mean confidence interval for cycles value: -0.14 0.99
95% mean confidence interval for cycles %-change: -13.14% 39.67%
Inconclusive result (value mean confidence interval includes 0).

total fma in shared programs: 22578.03 -> 22549.94 (-0.12%)
fma in affected programs: 1056.33 -> 1028.23 (-2.66%)
helped: 383
HURT: 0
helped stats (abs) min: 0.015625 max: 0.375 x̄: 0.07 x̃: 0
helped stats (rel) min: 0.55% max: 50.00% x̄: 3.07% x̃: 2.34%
95% mean confidence interval for fma value: -0.08 -0.07
95% mean confidence interval for fma %-change: -3.39% -2.75%
Fma are helped.

total cvt in shared programs: 14128.91 -> 14826.25 (4.94%)
cvt in affected programs: 1636.23 -> 2333.58 (42.62%)
helped: 0
HURT: 383
HURT stats (abs)   min: 0.0625 max: 2.109375 x̄: 1.82 x̃: 2
HURT stats (rel)   min: 2.52% max: 162.50% x̄: 43.50% x̃: 46.40%
95% mean confidence interval for cvt value: 1.76 1.88
95% mean confidence interval for cvt %-change: 42.07% 44.93%
Cvt are HURT.

total sfu in shared programs: 7549.31 -> 8601.81 (13.94%)
sfu in affected programs: 758.62 -> 1811.12 (138.74%)
helped: 0
HURT: 383
HURT stats (abs)   min: 0.375 max: 5.0 x̄: 2.75 x̃: 3
HURT stats (rel)   min: 23.08% max: 266.67% x̄: 136.66% x̃: 150.00%
95% mean confidence interval for sfu value: 2.67 2.83
95% mean confidence interval for sfu %-change: 133.02% 140.29%
Sfu are HURT.

total quadwords in shared programs: 1449928 -> 1479736 (2.06%)
quadwords in affected programs: 96544 -> 126352 (30.88%)
helped: 0
HURT: 382
HURT stats (abs)   min: 8.0 max: 96.0 x̄: 78.03 x̃: 88
HURT stats (rel)   min: 1.82% max: 100.00% x̄: 31.71% x̃: 34.38%
95% mean confidence interval for quadwords value: 75.63 80.43
95% mean confidence interval for quadwords %-change: 30.67% 32.75%
Quadwords are HURT.

total threads in shared programs: 53556 -> 53479 (-0.14%)
threads in affected programs: 154 -> 77 (-50.00%)
helped: 0
HURT: 77
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: -1.00 -1.00
95% mean confidence interval for threads %-change: -50.00% -50.00%
Threads are HURT.

Bifrost is hit harder, unfortunately:

total instructions in shared programs: 2414877 -> 2468058 (2.20%)
instructions in affected programs: 184585 -> 237766 (28.81%)
helped: 0
HURT: 383
HURT stats (abs)   min: 12.0 max: 160.0 x̄: 138.85 x̃: 155
HURT stats (rel)   min: 1.52% max: 111.94% x̄: 29.43% x̃: 31.44%
95% mean confidence interval for instructions value: 134.47 143.24
95% mean confidence interval for instructions %-change: 28.42% 30.45%
Instructions are HURT.

total tuples in shared programs: 1927478 -> 1964218 (1.91%)
tuples in affected programs: 133176 -> 169916 (27.59%)
helped: 0
HURT: 383
HURT stats (abs)   min: 5.0 max: 113.0 x̄: 95.93 x̃: 107
HURT stats (rel)   min: 1.02% max: 87.04% x̄: 28.44% x̃: 30.57%
95% mean confidence interval for tuples value: 92.80 99.05
95% mean confidence interval for tuples %-change: 27.47% 29.41%
Tuples are HURT.

total clauses in shared programs: 354853 -> 359513 (1.31%)
clauses in affected programs: 22918 -> 27578 (20.33%)
helped: 0
HURT: 381
HURT stats (abs)   min: 1.0 max: 15.0 x̄: 12.23 x̃: 14
HURT stats (rel)   min: 1.14% max: 60.00% x̄: 20.81% x̃: 22.58%
95% mean confidence interval for clauses value: 11.84 12.62
95% mean confidence interval for clauses %-change: 20.13% 21.49%
Clauses are HURT.

total cycles in shared programs: 166542.56 -> 167639.31 (0.66%)
cycles in affected programs: 5012.37 -> 6109.13 (21.88%)
helped: 0
HURT: 329
HURT stats (abs)   min: 0.20833199999999863 max: 4.666665999999999 x̄: 3.33 x̃: 3
HURT stats (rel)   min: 1.05% max: 51.06% x̄: 22.28% x̃: 22.78%
95% mean confidence interval for cycles value: 3.22 3.45
95% mean confidence interval for cycles %-change: 21.45% 23.10%
Cycles are HURT.

total arith in shared programs: 73643 -> 75173.17 (2.08%)
arith in affected programs: 5344.04 -> 6874.21 (28.63%)
helped: 0
HURT: 383
HURT stats (abs)   min: 0.20833199999999863 max: 4.666667 x̄: 4.00 x̃: 4
HURT stats (rel)   min: 1.05% max: 97.92% x̄: 29.47% x̃: 31.64%
95% mean confidence interval for arith value: 3.87 4.13
95% mean confidence interval for arith %-change: 28.45% 30.49%
Arith are HURT.

total quadwords in shared programs: 1673974 -> 1701720 (1.66%)
quadwords in affected programs: 111686 -> 139432 (24.84%)
helped: 0
HURT: 383
HURT stats (abs)   min: 5.0 max: 84.0 x̄: 72.44 x̃: 81
HURT stats (rel)   min: 1.11% max: 78.72% x̄: 25.59% x̃: 27.56%
95% mean confidence interval for quadwords value: 70.16 74.73
95% mean confidence interval for quadwords %-change: 24.74% 26.43%
Quadwords are HURT.

total threads in shared programs: 53655 -> 53590 (-0.12%)
threads in affected programs: 130 -> 65 (-50.00%)
helped: 0
HURT: 65
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: -1.00 -1.00
95% mean confidence interval for threads %-change: -50.00% -50.00%
Threads are HURT.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17266>