[llvm] [RISCV]Add support for resolving encoding conflicts among vendor specific CSRs (PR #96060)

[Garvit Gupta via llvm-commits]

quic-garvgupt wrote:

Abandoning this PR because directly created it for the main branch. Will create a new PR.

Apologies for the inconvenience

https://github.com/llvm/llvm-project/pull/96060