[llvm] [RISCV] fix SP recovery in a function epilogue (PR #110809)

[Benjamin S. Scarlet via llvm-commits]

bscarlet wrote:

Could you please include the complete flags you use to build LLVM so that I can reproduce your entire procedure.

Did you use the flags I included in my reproduction case in your steps 3 & 5?

https://github.com/llvm/llvm-project/pull/110809