[llvm] [LV] Check all users of partial reductions in chain have same scale. (PR #162822)

[Ramkumar Ramachandra 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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artagnon wrote:

```suggestion
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^scalar.ph:" --version 6
```

https://github.com/llvm/llvm-project/pull/162822