[llvm] [RISCV] Implement codegen for XAndesPerf lea instructions (PR #137925)

[Jim Lin via llvm-commits]

tclin914 wrote:

> This is failing MC tests probably because you changed the order of $rs1 and $rs2 which broke the encoding/decoding.

Fixed it.

https://github.com/llvm/llvm-project/pull/137925