[llvm] [LV] Add support for absolute difference partial reductions (PR #188043)

[Florian Hahn 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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fhahn wrote:

looks like the tests are still part of the PR, would  be good to remove here or merge https://github.com/llvm/llvm-project/pull/191383 first

https://github.com/llvm/llvm-project/pull/188043