[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:

The test in partial-reduce.ll has the SVE attribute which means it will generate scalable code for the CHECK-MAXBW tests. I can change this one to partial-reduce-sve.ll.

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