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WaveShuffleIndexSinking Pass shuffleGroup by basic block
The WaveShuffleIndexSinking Pass doesn't consider program control flow,
potentially producing invalid IR if users aren't dominated. It merges
instructions globally, risking undefined instructions if blocks are
entered out of order, leading to incorrect calculations. Now,
shuffleGroups are formed by channel and within the same basic block.
(cherry picked from commit 8201e09)
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