[llvm] [RISCV][CFI] add function epilogue cfi information (PR #110234)

[Kito Cheng via llvm-commits]

kito-cheng wrote:

Could you take a look this https://reviews.llvm.org/D114545? and try to enable that for RISC-V to address the issue that Craig mention.

https://github.com/llvm/llvm-project/pull/110234