[llvm] [RISCV] Move VMV0 elimination past machine SSA opts (PR #126850)

[Pengcheng Wang via llvm-commits]

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

LGTM.
I tend to move this forward as these results seem to be attracting. :-)

https://github.com/llvm/llvm-project/pull/126850