spirv,turnip: Use 16 bit for RelaxedPrecision-decorated ALU ops
Improves gfxbench vk-5-normal performance by 5.5% on turnip. Followup change for another 2.5%.
Edited by Emma Anholt
Improves gfxbench vk-5-normal performance by 5.5% on turnip. Followup change for another 2.5%.