[llvm] [RISCV][CostModel] Refine Arithmetic reduction costs (PR #79103)

[Shih-Po Hung via llvm-commits]

arcbbb wrote:

>From llvm test-suite, I don't see difference in metrics SLP.NumVectorInstructions and loop-vectorize.LoopsVectorized.

https://github.com/llvm/llvm-project/pull/79103