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

[via llvm-commits]

================
@@ -27,6 +27,64 @@
 
 using namespace llvm;
 
+namespace {
+
+class CFISaveRegisterEmitter {
+  MachineFunction &m_MF;
----------------
dlav-sc wrote:

addressed

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