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nir: intel/fs: Various optimizations of BFI to reduce register pressure

Ian Romanick requested to merge idr/mesa:review/reassociate-bfi into main

The biggest change is a new pass that tries to reassociate nir_op_bfi operations to eliminate some constant sources. This is currently only enabled on Intel drivers. I don't know if it would be helpful on other hardware.

Edited by Ian Romanick

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