[llvm] [RISCV][LoopVectorize] Use DataWithEVL as the preferred tail folding style (PR #148686)

[Pengcheng Wang via llvm-commits]

https://github.com/wangpc-pp approved this pull request.

LGTM as what we have discussed in RISC-V China Summit, we support this!

https://github.com/llvm/llvm-project/pull/148686