[llvm] [AArch64] Emit async PAuth epilogue CFI for outlined functions (PR #189924)

[Amina Chabane via llvm-commits]

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@@ -143,7 +143,9 @@ void AArch64PointerAuthImpl::authenticateLR(
     MachineFunction &MF, MachineBasicBlock::iterator MBBI) const {
   const AArch64FunctionInfo *MFnI = MF.getInfo<AArch64FunctionInfo>();
   bool UseBKey = MFnI->shouldSignWithBKey();
-  bool EmitAsyncCFI = MFnI->needsAsyncDwarfUnwindInfo(MF);
+  bool EmitAsyncCFI = MFnI->needsAsyncDwarfUnwindInfo(MF) ||
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Amichaxx wrote:

Hi @momchil-velikov, thank you for the review and explanation.

> The patch certainly does not affect only outlined functions, so at least the description is incorrect

Yes, I agree it is a misleading title. 

I can see emitting the marker alone is not useful, without the rest of the CFI. It seems a larger change that fixes the noted limitation would handle this, but is out of scope for this PR. I think it's best to drop this PR for now and revisit if/when I can tackle the fuller fix.

https://github.com/llvm/llvm-project/pull/189924