[llvm] [PtrAuth] Add ConstantPtrAuth comparator to FunctionComparator.cpp (PR #159480)

[Oskar Wirga via llvm-commits]

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oskarwirga wrote:

I initially auto-generated checks but reverted to base manual checks after this comment: https://github.com/llvm/llvm-project/pull/159480#discussion_r2357046232

Do you have a strong preference?

https://github.com/llvm/llvm-project/pull/159480