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

[via llvm-commits]

joanahalili wrote:

Hello, 
This commit is causing a large number of targets failing on our end, for which there is also a reproducer posted on the issue above https://github.com/llvm/llvm-project/issues/113488.  Could you please have a look and possibly revert?
If there is no activity on the commit we will have to revert ourselves to unblock us.

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