[SLP][REVEC] VF should be scaled when ScalarTy is FixedVectorType.#114551

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

HanKuanChen:slp-revec-getScalarizationOverheadHanKuanChen/llvm-project:slp-revec-getScalarizationOverheadCopy head branch name to clipboard