[RISCV][CostModel] cost of vector cttz/ctlz under ZVBB#115800

LiqinWeng merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

LiqinWeng:add-cost-for-cttz/ctlzLiqinWeng/llvm-project:add-cost-for-cttz/ctlzCopy head branch name to clipboard