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

[Luke Lau via llvm-commits]

lukel97 wrote:

On second thought though this does remove the @llvm.riscv.masked.strided.load and @llvm.riscv.masked.strided.store intrinsics which is breaking. Maybe there's an argument for backporting so we don't have people using them in the meantime.

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