[VectorCombine] foldShuffleOfShuffles - fold "shuffle (shuffle x, undef),...
[VectorCombine] foldShuffleOfShuffles - fold "shuffle (shuffle x, undef), (shuffle y, undef)" -> "shuffle x, y" (#88743) Another step towards cleaning up shuffles that have been split, often across bitcasts between SSE intrinsic. Strip shuffles entirely if we fold to an identity shuffle.
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