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

[Jim Lin via llvm-commits]

tclin914 wrote:

> IIUC, they are equivalent to Zba? Maybe we should reuse the base pattern?

Thanks for the reminder. I've update the patterns for Zba that we can reuse it.

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