[RISCV] Rewrite vlseg tests to avoid riscv.tuple.extract [nfc]#151003

preames merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

preames:pr-riscv-vlseg-rewrite-testspreames/llvm-project:pr-riscv-vlseg-rewrite-testsCopy head branch name to clipboard