[llvm] [SimplifyCFG] Avoid sinking loads/stores that impact vectorization (PR #222587)

[Nikita Popov via llvm-commits]

nikic wrote:

Why is it not possible to handle this in the vectorizer?

I think that trying to avoid transforms to keep code in a shape the current vectorizer likes is a losing proposition, and I believe that pretty much all previous attempts to do this ultimately ended up making the vectorizer more powerful instead.

https://github.com/llvm/llvm-project/pull/222587