[llvm] [RISCV] Optimize divide by constant for VP intrinsics (PR #125991)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> @lukel97 if the vectorizer is moving away from using VP intrinsics, I guess we don't need this patch anymore?

IIUC, it it temporary? We may add it back in some day.

https://github.com/llvm/llvm-project/pull/125991