Simon Pilgrim 7c17f1ea84 [X86][SSE] isHorizontalBinOp - use getTargetShuffleInputs helper (REAPPLIED) ...

Use the getTargetShuffleInputs helper for all shuffle decoding

Reapplied (after reversion in rGfa0aff6d6960) with fix+test for subvector splitting - we weren't accounting for peeking through bitcasts changing the vector element count of the shuffle sources.

2021-04-03 11:59:19 +01:00

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