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rusticl/kernel: explicitly set rounding modes

Karol Herbst requested to merge karolherbst/mesa:rusticl/kernel/rounding_mode into main

rusticl/kernel: explicitly set rounding modes

Since dbbf5665 ("aco,ac/llvm,radeonsi: lower f2f16 to f2f16_rtz in nir") radeonsi behavior changed and some of the core fp16 ops broke as a result.

We should explicitly specify the rounding mode until we add an gallium API for drivers to advertize what they prefer.

Cc: mesa-stable

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