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lima: ppir: handle FFMA in backend

Vasily Khoruzhick requested to merge anarsoul/mesa:lima-ppir-ffma into main

ppir doesn't do a good job in fusing ffma, so allow nir to do it and handle ffma in backend.

shader-db:

total instructions in shared programs: 29485 -> 29066 (-1.42%)
instructions in affected programs: 10362 -> 9943 (-4.04%)
helped: 114
HURT: 5
helped stats (abs) min: 1 max: 30 x̄: 3.72 x̃: 2
helped stats (rel) min: 0.78% max: 20.00% x̄: 5.66% x̃: 4.31%
HURT stats (abs)   min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel)   min: 0.52% max: 1.09% x̄: 0.85% x̃: 0.98%
95% mean confidence interval for instructions value: -4.37 -2.67
95% mean confidence interval for instructions %-change: -6.10% -4.68%
Instructions are helped.

total loops in shared programs: 2 -> 2 (0.00%)
loops in affected programs: 0 -> 0
helped: 0
HURT: 0

total spills in shared programs: 369 -> 367 (-0.54%)
spills in affected programs: 199 -> 197 (-1.01%)
helped: 8
HURT: 9

total fills in shared programs: 1265 -> 1208 (-4.51%)
fills in affected programs: 758 -> 701 (-7.52%)
helped: 11
HURT: 9
Edited by Vasily Khoruzhick

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