[llvm] [RISCV] Emit VP strided loads/stores in RISCVGatherScatterLowering (PR #98111)

[Luke Lau via llvm-commits]

lukel97 wrote:

I don't think anyone would start using them given that it's not documented and they could just use `@llvm.riscv.vlse.mask`/`@llvm.riscv.vsse.mask` instead. I can't find any existing users at least in the textual format from a quick search on GitHub.

https://github.com/llvm/llvm-project/pull/98111