[AArch64] Add initial support for PAC relocs #2
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TODO: do we need this to be done for vDSO as well?
- Do not check pointer signature before we are relocated as this might be a pointer to global. - Sign function pointers returned from __vdsosym. - Do not apply PAC relocs in __dls2, because we may need to do this second time in __dls3. We can't do this as we overwrite authentication scheme when applying relocs.
…sing We use `#if __has_feature(ptrauth_calls)` there.
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Previously, the pointer was signed two times, and authenticated only once.
…resent Previously, it was signed unconditionally w/o taking the dynamic tag into account (only `__has_feature(ptrauth_calls)` was checked by preprocessor). See also specification: https://github.com/ARM-software/abi-aa/blob/main/pauthabielf64/pauthabielf64.rst#recording-a-signed-plt-got-in-the-elf-file
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This replaces #1 with some enhancements: