[llvm] [LV] Check for vector-to-scalar casts in legalizer (PR #106244)

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ErikHogeman wrote:

> > > Might be good to retitle this s/LoopVectorize/LV/.
> > 
> > 
> > Do you mean in the commit message?
> 
> You can just re-title the PR using the GitHub interface, and that will be used as the commit message when you merge.

Thanks, updated the title.

I also added a use of the "srem" now in the loop, and added a user-defined vectorization width to make it more robust that it triggers the bad code path. The test still crashes without the fix.

https://github.com/llvm/llvm-project/pull/106244