[llvm] [ARM] Lower vector interleave operations (PR #225670)

[David Green via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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davemgreen wrote:

Can remove fixed- from the test name for these ones.

https://github.com/llvm/llvm-project/pull/225670