[llvm] [LV][NFC] Remove more unnecessary passes from RUN lines (PR #193686)

[Florian Hahn via llvm-commits]

https://github.com/fhahn approved this pull request.

LGTM, thanks

Don't need to pul more into this PR if it requires CHECK line changes, just mentioned `-simplifycfg-require-and-preserve-domtree=1 ` because it looks like at least the tests below pass it without running `simplifycfg`


```
llvm/test/Transforms/LoopVectorize/vectorize-once.ll
1:; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -S -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s

llvm/test/Transforms/LoopVectorize/if-pred-not-when-safe.ll
1:; RUN: opt -S -force-vector-width=2 -force-vector-interleave=1 -passes=loop-vectorize -verify-loop-info -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/193686