vulkan: unpack more values at a time for iquants mat mul #14485
+83
−73
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This change was taken from @remyoudompheng's #12260 and rebased as the original PR has been abandoned for a while. @remyoudompheng if you'd rather submit this yourself please let me know.
On my RX 470 it's around 10-15% faster.
PR:
Master: