[SLP][REVEC] Fix the number of elements in the mask of a ShuffleVectorInst is not a power of 2.#119689

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

HanKuanChen:slp-revec-non-power-of-2-shufflevectorHanKuanChen/llvm-project:slp-revec-non-power-of-2-shufflevectorCopy head branch name to clipboard