[libunwind] [PAC][libunwind] Pass ptrauth-qualified values as const references (PR #173765)

[Daniil Kovalev via cfe-commits]

kovdan01 wrote:

@ojhunt Could you please take a look at this and ensure that it does not break anything when running your local Apple-specific tests?

I do not expect any breakages since casts like `__ptrauth(/*...*/) uint64_t` -> `void *` are handled by the compiler properly. So, when calling functions which expect unsigned pointers (see for example calls in `LocalAddressSpace::findUnwindSections`), we properly do an auth and then pass the unsigned pointers as expected.

But, even though no breakages are expected, it's always worth to try it out before merging :)

https://github.com/llvm/llvm-project/pull/173765