[llvm] [RISC-V] Fix incorrect epilogue_begin (PR #120623)

[Venkata Ramanaiah Nalamothu via llvm-commits]

RamNalamothu wrote:

> Can you split the interface change that affects every target into a separate from the RISCV specific change?

It is already separate. This PR has two commits, one which makes the interface change and the other which uses the revised interface to fix RISC-V specific issue.

Or are you suggesting making two PRs, one for the interface change and one for RISC-V specific fix?

https://github.com/llvm/llvm-project/pull/120623