[llvm] [RISCV] Combine ADDD(lo, hi, x, 0) -> WADDAU(lo, hi, x, 0). Combine WADDAU (WADDAU lo, hi, x, 0), y, 0 -> WADDAU lo, hi, x, y (PR #181396)

[Sam Elliott via llvm-commits]

https://github.com/lenary approved this pull request.

LGTM. One nit, you can land after you decide what to do about it (if anything)

https://github.com/llvm/llvm-project/pull/181396