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07257410 iris: Emit default L3 config for the render pipeline

I think this might be needed for another platform, but should we just init the state for all platforms?

d7f9b2d9 st/mesa: add support for lowering fp64/int64 for nir drivers. (v2)
ea4c9861 iris: Enable soft-fp64 for devices that don't have 64-bit types

These seem to enable soft-fp64, but I didn't test too much. Maybe I should just send airlied's patch to Mesa directly?