[llvm] [RISCV] Account for VL toggle cost when splitting VP memory intrinsics (PR #223992)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

I guess not really a question for LoopVectorizer, but do we have a similar VL toggle problem when splitting fixed vectors?

https://github.com/llvm/llvm-project/pull/223992