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

[Jon Roelofs via llvm-commits]

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jroelofs wrote:

```suggestion
        unsigned AutOpc = UseBKey ? AArch64::AUTIBSP : AArch64::AUTIASP;
        BuildMI(MBB, MBBI, DL, TII->get(AutOpc))
```

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