[PATCH] D121088: [AArch64] Concat zip1 and zip2 is a wider zip1

[Dave Green via Phabricator via llvm-commits]

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Given `concat(zip1(a, b), zip2(a, b))`, we can convert that to a 128bit `zip1(a, b)` if we widen a and b out first.

Fixes #54226


https://reviews.llvm.org/D121088

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/arm64-zip.ll

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