[RISCV] Commute True in foldVMergeToMask#156499

lukel97 merged 3 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:vector-peephole/commute-vmerge-foldlukel97/llvm-project:vector-peephole/commute-vmerge-foldCopy head branch name to clipboard