[FlyDSL] gfx942 a16wi4: pack f32->bf16 with lshr-16 instead of scalar - #5017

[FlyDSL] gfx942 a16wi4: pack f32->bf16 with lshr-16 instead of scalar#5017

samremes merged 2 commits into

mainROCm/aiter:mainfrom

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