[VectorCombine] foldShuffleToIdentity - peek through bitcasts to see if they come from the same value to form identity sequence (#98334) Workaround until I can get #96884 fixed properly - when trying to find identity sequences, peek through any bitcasts to see if the values all came from the same source. We don't run CSE frequently enough to merge all the bitcasts that we end up with.
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