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This hardens the unwinding logic and datastructures on systems that support pointer authentication. The approach taken to hardening is to harden the schemas of as many high value fields in the myriad structs as possible, and then also explicitly qualify local variables referencing privileged or security critical values. This does introduce ABI linkage between libcxx, libcxxabi, and libunwind but those are in principle separate from the OS itself so we've kept the schema definitions in the library specific headers rather than ptrauth.h