[LV][VPlan] Prevent calculate cost for skiped instructions in precomputeCosts().#127966

ElvisWang123 merged 4 commits intollvm:mainllvm/llvm-project:mainfrom

ElvisWang123:fix-skip-insts-in-exit-condtionElvisWang123/llvm-project:fix-skip-insts-in-exit-condtionCopy head branch name to clipboard