[RISCV] Add fixed-length patterns for disjoint or patterns for vwadd[u].v{v,x}#136824

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

lukel97:disjoint-or-vwadd-pats-fixedlukel97/llvm-project:disjoint-or-vwadd-pats-fixedCopy head branch name to clipboard