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nir: add another common ffract -> ffloor pattern

Timothy Arceri requested to merge tarceri/mesa:ffract_opt into main

shader-db results (BDW):

total instructions in shared programs: 17527053 -> 17526931 (<.01%)
instructions in affected programs: 5116 -> 4994 (-2.38%)
helped: 25
HURT: 0
helped stats (abs) min: 2 max: 15 x̄: 4.88 x̃: 3
helped stats (rel) min: 0.25% max: 5.34% x̄: 3.39% x̃: 3.90%
95% mean confidence interval for instructions value: -6.19 -3.57
95% mean confidence interval for instructions %-change: -3.98% -2.81%
Instructions are helped.

total cycles in shared programs: 856680230 -> 856682009 (<.01%)
cycles in affected programs: 6583780 -> 6585559 (0.03%)
helped: 117
HURT: 77
helped stats (abs) min: 1 max: 854 x̄: 68.56 x̃: 16
helped stats (rel) min: <.01% max: 35.34% x̄: 2.12% x̃: 0.76%
HURT stats (abs)   min: 1 max: 2188 x̄: 127.27 x̃: 18
HURT stats (rel)   min: 0.01% max: 22.66% x̄: 1.86% x̃: 0.67%
95% mean confidence interval for cycles value: -30.07 48.41
95% mean confidence interval for cycles %-change: -1.28% 0.19%
Inconclusive result (value mean confidence interval includes 0).

LOST:   3
GAINED: 1
Edited by Timothy Arceri

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