[llvm] [InstCombine][RISCV] Convert VPIntrinsics with splat operands to splats (PR #65706)

[Wang Pengcheng via llvm-commits]

wangpc-pp wrote:

Just a practice suggestion: `-m` can be used with `--fixup`, and the followed message will be the body of commit message. Then, we can describe what the changes are just like when we update differential in Phabricator. :-)

https://github.com/llvm/llvm-project/pull/65706