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Bug fix and optimization for pack and unpack

Ian Romanick requested to merge idr/mesa:review/optimize-bfi into master

First patch fixes a bug introduced in !2271 (merged) (attn: @pendingchaos). The second patch introduces the pack_half_2x16_split variant of the (fixed) optimization. I don't have fossils for that game, so I can't check for any changes.

The third patch introduces a new, minor optimization.

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