[llvm] [RISCV][NFC] refactor CFI emitting (PR #114227)

[Sam Elliott via llvm-commits]

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@@ -1737,39 +1776,14 @@ void RISCVFrameLowering::emitCalleeSavedRVVPrologCFI(
   for (auto &CS : RVVCSI) {
     // Insert the spill to the stack frame.
     int FI = CS.getFrameIdx();
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lenary wrote:

(CFISaveRVVRegisterEmitter is now gone, so this question doesn't matter)

https://github.com/llvm/llvm-project/pull/114227