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nir,radv,aco,ac/nir: normalize zero vectors to zero

Rhys Perry requested to merge pendingchaos/mesa:radv_nir_aco_acnir_normalize_zero_to_zero into main

The result of normalize(0.0) seems to be undefined in the GLSL specification and our current implementation gives NaN. With this MR, a Vulkan driver which implements the new nir_op_fmul_zerowins can have normalize(0.0) give zero instead.

Closes: #4678 (closed)

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