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

[Benjamin S. Scarlet via llvm-commits]

bscarlet wrote:

I believe this change is the cause of a miscompilation I'm seeing (automatically linked above). Please take a look, and kindly revert the change until that issue is resolved.

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