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intel/fs: Stop building SIMD8 programs on Xe2+.

Francisco Jerez requested to merge currojerez/mesa:intel-xe2-simd8-removal into main

This MR based on !26585 (merged) switches off SIMD8 compilation on Xe2+ devices and changes geometry stages to use SIMD16 instead. Xe2 devices have 16-wide ALUs so SIMD8 instructions can no longer fully utilize the EUs -- Most of the fixed functions can no longer even dispatch SIMD8 threads on LNL+, so this is change is necessary for hardware enabling.

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