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

[Gaëtan Bossu via llvm-commits]

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gbossu wrote:

Super-nit: I guess interleave/deinterlave intrinsics aren't considered trivially vectorizable and anyway they change the EC, but maybe it's worth adding an assert to ensure we don't let any vector_interleave pass through?

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