[llvm] [RISCV] Fixed redundant add instructions generated during the fold of vscale add in rvv. (PR #225266)

[via llvm-commits]

FoolgryGamer wrote:

I have resubmitted a commit that includes formatting and comment changes.
Thanks all for the feedback mentioned above. :-)

I have another question: if I want to continue contributing to the community, should I focus only on existing issues?

https://github.com/llvm/llvm-project/pull/225266