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

[David Sherwood via llvm-commits]

david-arm wrote:

> It looks like there are a few more tests that use `simplify cfg`, are those still needed?
> 
> Some tests also pass `-simplifycfg-require-and-preserve-domtree`, without running `simplifycfg` it seems. Would be good to also clean those up

For the other tests that use simplifycfg, removing the pass leads to IR changes so I thought it was best to leave those to another PR? I can take a look at removing unnecessary `-simplifycfg-require-and-preserve-domtree` flags in this PR though?

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