[RISCV] Use ri.vzip2{a,b} for interleave2 if available#136364

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

preames:pr-riscv-xrivosvizip-interleave2preames/llvm-project:pr-riscv-xrivosvizip-interleave2Copy head branch name to clipboard