[llvm] [SandboxVectorizer] Use sbvec-passes flag to create a pipeline of Region passes after BottomUpVec. (PR #111223)

[Jorge Gorbe Moya via llvm-commits]

slackito wrote:

I'm not sure this is the way it should work but if not at least I hope to get some clarity out of the review :)

https://github.com/llvm/llvm-project/pull/111223