[llvm] [AArch64][PAC] Introduce AArch64::PAC pseudo instruction (PR #146488)

[Anatoly Trosinenko via llvm-commits]

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@@ -182,6 +182,13 @@ class AArch64TargetLowering : public TargetLowering {
   MachineBasicBlock *EmitGetSMESaveSize(MachineInstr &MI,
                                         MachineBasicBlock *BB) const;
 
+  /// Replace (0, vreg) discriminator components with the operands of blend
+  /// or with (immediate, XZR) when possible.
+  void fixupBlendComponents(MachineInstr &MI, MachineBasicBlock *BB,
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atrosinenko wrote:

Renamed to `fixupPtrauthDiscriminator`, thanks.

https://github.com/llvm/llvm-project/pull/146488