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

[Eli Friedman via cfe-commits]

================
@@ -8287,6 +8289,13 @@ AArch64TargetLowering::LowerCall(CallLoweringInfo &CLI,
 
   SDValue InGlue;
   if (RequiresSMChange) {
+
+    if (Subtarget->hasSVE()) {
----------------
efriedma-quic wrote:

If there's no DWARF unwind, nothing can unwind the stack whether or not we 
store the VG.

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