[clang] [PAC] Implement function pointer re-signing (PR #98847)

[Akira Hatanaka via cfe-commits]

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+// RUN: %clang_cc1 -fptrauth-function-pointer-type-discrimination -triple arm64-apple-ios -fptrauth-calls -fptrauth-intrinsics -emit-llvm %s  -o - | FileCheck -check-prefix=CHECK -check-prefix=NOPCH %s
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ahatanak wrote:

Sorry, I just realized the test cases in `ptrauth.c` are duplicates of the ones added to `CodeGen/ptrauth-function-type-discriminator.c` and `CodeGen/ptrauth-function.c`. I'll remove the file.

https://github.com/llvm/llvm-project/pull/98847