[llvm] [AArch64] Fix return address auth in tail call epilogues (PR #189484)

[Jon Roelofs via llvm-commits]

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jroelofs wrote:

```suggestion
        if (Subtarget->hasPAuthLR()) {
          unsigned AutOpc = UseBKey ? AArch64::AUTIB171615 : AArch64::AUTIA171615;
          BuildMI(MBB, MBBI, DL, TII->get(AutOpc))
              .setMIFlag(MachineInstr::FrameDestroy);
        } else {
          BuildMI(MBB, MBBI, DL, TII->get(AArch64::PACM))
              .setMIFlag(MachineInstr::FrameDestroy);
          unsigned AutOpc = UseBKey ? AArch64::AUTIB1716 : AArch64::AUTIA1716;
          BuildMI(MBB, MBBI, DL, TII->get(AutOpc))
              .setMIFlag(MachineInstr::FrameDestroy);
        }
```

https://github.com/llvm/llvm-project/pull/189484