[llvm] [VectorCombine] Fold Deinterleave/Interleave Pairs (PR #211022)

[Gaëtan Bossu via llvm-commits]

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gbossu wrote:

I do find it clearer, but I agree it's not as "transformational" as I hoped 😄  IMO it still does help readability because the main loop is more concise. Although, we could have achieved that without a class. It's fine by me as is, but feel free to get rid rid of the class and just have "free" functions if you prefer Jacob 🙂 

https://github.com/llvm/llvm-project/pull/211022