[llvm] [RISCV] Expand vp.stride.load to splat of a scalar load. (PR #98140)

[Luke Lau via llvm-commits]

lukel97 wrote:

Woops, I think this needs rebased after #98205. I wish we had a merge queue to catch these types of things

https://github.com/llvm/llvm-project/pull/98140