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

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ErikHogeman wrote:

I just realized that while rebasing and squashing I reverted to the old commit message using the full name for LoopVectorize instead of LV as suggested in the review, apologies for that. Let me know if there's anything you want me to do, I assume it's too late to change now.

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