zink: clamp shader input/output max values
some vulkan drivers (e.g., amdvlk) advertise absolutely huge values here, resulting in bitmask overflows everywhere since gallium assumes a max of 32 for all cases
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some vulkan drivers (e.g., amdvlk) advertise absolutely huge values here, resulting in bitmask overflows everywhere since gallium assumes a max of 32 for all cases