[llvm] [RISCV] Set DebugLoc of epilogue (PR #74702)

[Wang Pengcheng via llvm-commits]

wangpc-pp wrote:

> What do X86 or Aarch64 do? I'm not sure if I trust copying something from MIPS. MIPS doesn't seem to be getting many contributions these days.

Sorry for unclear description, most in-tree targets will use the `DebugLoc` getting from the insert point `I`. But the two targets (AArch64/X86) you mentioned don't do it in `loadRegFromStackSlot`... I don't know if they have the issue.

https://github.com/llvm/llvm-project/pull/74702