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

[Craig Topper via llvm-commits]

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

LLVM doesn't use `m_` and we don't generally have underscores in variable names.

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