[llvm] [LV] Add support for partial reductions without a binary op (PR #133922)

[Matthew Devereau via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^scalar.ph:" --version 4
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MDevereau wrote:

Or rather, it should be possible to delete partial-reduce-neon.ll and instead just use different attributes for each test instead of having a different file

https://github.com/llvm/llvm-project/pull/133922