[llvm] [LoadStoreVectorizer] Fill gaps in load/store chains to enable vectorization (PR #159388)

[Drew Kersnar via llvm-commits]

dakersnar wrote:

I've updated this PR to generate masked loads as discussed, and it can be reviewed now. In the next day or two, I will update the NVPTX change that this is dependent on (https://github.com/llvm/llvm-project/pull/159387) to handle lowering of the masked load intrinsics. At that point they will both be ready for review. I'm hoping to merge them at the same time, back to back, once review iteration is done.

https://github.com/llvm/llvm-project/pull/159388