[llvm] [RISCV] Handle scalable ops with < EEW / 2 narrow types in combineBinOp_VLToVWBinOp_VL (PR #84158)

[via llvm-commits]

https://github.com/sun-jacobi approved this pull request.

Thanks for providing this elegant way. LGTM

https://github.com/llvm/llvm-project/pull/84158