[llvm] [LoadStoreVectorizer] Propagate alignment through contiguous chain (PR #145733)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

I still have the feeling this is beyond the scope of what the vectorizer should be doing. Attributor / functionattrs + instcombine should be dealing with this 

https://github.com/llvm/llvm-project/pull/145733