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iris: Enable nir_opt_large_constants

Faith Ekstrand requested to merge gfxstrand/mesa:review/iris-large-constants into master

Shader-db results on Kaby Lake:

total instructions in shared programs: 15306230 -> 15304726 (<.01%)
instructions in affected programs: 4570 -> 3066 (-32.91%)
helped: 16
HURT: 0

total cycles in shared programs: 361703436 -> 361680041 (<.01%)
cycles in affected programs: 129388 -> 105993 (-18.08%)
helped: 16
HURT: 0

LOST:   0
GAINED: 2

The helped programs were in XCom 2, Deus Ex: Mankind Divided, and Kerbal Space Program

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