[libc][SVE] add sve handling for memcpy with count less than 32b#167446

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

SchrodingerZhu:libc/aarch64-scalable-memcpySchrodingerZhu/llvm-project:libc/aarch64-scalable-memcpyCopy head branch name to clipboard