pan/bi: Propagate fabs/neg/sat

pan/bi: Propagate fabs/neg/sat

Initial support for modifier propagation. Bifrost makes this
unreasonably hard.

total instructions in shared programs: 151604 -> 150761 (-0.56%)
instructions in affected programs: 48773 -> 47930 (-1.73%)
helped: 212
HURT: 0
helped stats (abs) min: 1 max: 28 x̄: 3.98 x̃: 1
helped stats (rel) min: 0.29% max: 12.70% x̄: 1.75% x̃: 1.26%
95% mean confidence interval for instructions value: -4.71 -3.25
95% mean confidence interval for instructions %-change: -1.97% -1.53%
Instructions are helped.

total tuples in shared programs: 131876 -> 131560 (-0.24%)
tuples in affected programs: 25393 -> 25077 (-1.24%)
helped: 104
HURT: 3
helped stats (abs) min: 1 max: 28 x̄: 3.08 x̃: 2
helped stats (rel) min: 0.34% max: 8.57% x̄: 1.55% x̃: 1.04%
HURT stats (abs)   min: 1 max: 2 x̄: 1.33 x̃: 1
HURT stats (rel)   min: 0.51% max: 2.86% x̄: 1.30% x̃: 0.53%
95% mean confidence interval for tuples value: -3.63 -2.28
95% mean confidence interval for tuples %-change: -1.73% -1.21%
Tuples are helped.

total clauses in shared programs: 28122 -> 28032 (-0.32%)
clauses in affected programs: 2720 -> 2630 (-3.31%)
helped: 58
HURT: 1
helped stats (abs) min: 1 max: 6 x̄: 1.57 x̃: 1
helped stats (rel) min: 0.88% max: 14.29% x̄: 4.06% x̃: 3.67%
HURT stats (abs)   min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel)   min: 7.69% max: 7.69% x̄: 7.69% x̃: 7.69%
95% mean confidence interval for clauses value: -1.85 -1.20
95% mean confidence interval for clauses %-change: -4.60% -3.13%
Clauses are helped.

total quadwords in shared programs: 119778 -> 119509 (-0.22%)
quadwords in affected programs: 20698 -> 20429 (-1.30%)
helped: 95
HURT: 1
helped stats (abs) min: 1 max: 28 x̄: 2.85 x̃: 2
helped stats (rel) min: 0.38% max: 7.14% x̄: 1.50% x̃: 1.13%
HURT stats (abs)   min: 2 max: 2 x̄: 2.00 x̃: 2
HURT stats (rel)   min: 3.23% max: 3.23% x̄: 3.23% x̃: 3.23%
95% mean confidence interval for quadwords value: -3.49 -2.11
95% mean confidence interval for quadwords %-change: -1.71% -1.20%
Quadwords are helped.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11327>