[IR][RISCV] Remove @llvm.experimental.vp.splat (#171084) @llvm.experimental.vp.splat was originally added in #98731 in order to prevent VL toggles when optimizing a zero strided load to a scalar load + splat on RISC-V: #101329 However, the need to explicitly set the VL operand has been superseded by RISCVVLOptimizer which can infer this automatically based on the splat's users, and the use of the vp.splat intrinsic was removed in #170543. Now that there are no users of @llvm.experimental.vp.splat internal to LLVM and it's unlikely we will need it in future due to RISCVVLOptimizer, this patch removes the intrinsic. I couldn't find any publicly available out-of-tree users of the intrinsic with a quick search on GitHub.
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