[llvm] [RISCV] Always expand zero strided vp.strided.load (PR #98901)

[Philip Reames via llvm-commits]

https://github.com/preames approved this pull request.

LGTM

It's unfortunately we loose the smaller EVL here, but this looks like the right pragmatic tradeoff at the moment.  

https://github.com/llvm/llvm-project/pull/98901