[clang] [PAC] Add support for __ptrauth type qualifier (PR #100830)

[Daniil Kovalev via cfe-commits]

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+// RUN: %clang_cc1 %s       -fptrauth-function-pointer-type-discrimination -triple arm64e-apple-ios13 -fptrauth-calls -fptrauth-intrinsics -disable-llvm-passes -emit-llvm -o- | FileCheck %s
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kovdan01 wrote:

Nit: it looks like you can use arm64-apple-ios13 triple instead of arm64e-apple-ios13. You anyway enable desired options manually. In other tests, just arm64 is used, so it's probably better to keep things consistent here.

```suggestion
// RUN: %clang_cc1 %s       -fptrauth-function-pointer-type-discrimination -triple arm64-apple-ios13 -fptrauth-calls -fptrauth-intrinsics -disable-llvm-passes -emit-llvm -o- | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/100830