[clang] [llvm] [AArch64][SME] Save VG for unwind info when changing streaming-mode (PR #83301)

[Sander de Smalen via llvm-commits]

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@@ -223,6 +228,12 @@ class AArch64FunctionInfo final : public MachineFunctionInfo {
   Register getPStateSMReg() const { return PStateSMReg; };
   void setPStateSMReg(Register Reg) { PStateSMReg = Reg; };
 
+  int64_t getVGIdx() const { return VGIdx; };
+  void setVGIdx(unsigned Idx) { VGIdx = Idx; };
+
+  int64_t getStreamingVGIdx() const { return StreamingVGIdx; };
+  void setStreamingVGIdx(unsigned Idx) { StreamingVGIdx = Idx; };
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sdesmalen-arm wrote:

minor nit: Could you use `FrameIdx` instead of just `Idx`?

https://github.com/llvm/llvm-project/pull/83301