[llvm] [LoadStoreVectorizer] Support vectorization of mixed-type contiguous accesses (PR #177908)

[Anshil Gandhi via llvm-commits]

gandhi56 wrote:

> Created an RFC on discourse to resolve the inttoptr discussion: https://discourse.llvm.org/t/loadstorevectorizer-requesting-review-pointer-recovery-in-mixed-type-vectorization-inttoptr-ptrtoint/91721

>From the discussion, it seems that we need some additional preliminary patches to handle the byte type in `CreateBitPreservingCastChain`. I will create them in a couple days.

https://github.com/llvm/llvm-project/pull/177908