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

[Benjamin S. Scarlet via llvm-commits]

bscarlet wrote:

We can now confirm that despite initial appearances, this patch does not seem to be the culprit. I've closed the corresponding issue. Apologies for the false alarm, and thank you for helping investigate. 

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