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aco/ra: use SDWA for 16bit instructions when the second byte is blocked

Georg Lehmann requested to merge DadSchoorse/mesa:aco-16bit-single-byte-write into main

Found by inspection, I think this can happen with pack_32_4x8(f2u8(a@16)), which will use v_cvt_u16_f16 (a 16bit instruction) with a v1b definition.

No Foz-DB changes on Navi21.

Cc: mesa-stable

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