[llvm] [RISCV] Update V0Defs after moving Src in peepholes (PR #107359)

[Luke Lau via llvm-commits]

lukel97 wrote:

I just want to point out that I agree with the discussion in https://github.com/llvm/llvm-project/pull/106753/files#r1739182733, it's probably worthwhile looking into a smaller mapping in a future PR, e.g. only store instructions that use V0.

https://github.com/llvm/llvm-project/pull/107359