zld: handle parsing and synthesising unwind info in the MachO linker #14397
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Changes only pertain arm64 as for x86_64 turns out we are missing one additional feature which is synthesising unwind info from only eh frame records, or at least this is what it looks like when I analysed the output of Apple's ld.
Unlike Apple ld, we will not do any DWARF CFI parsing and simply output DWARF type unwind records.
This was referenced Jan 24, 2023
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tl;dr adds support for C++ exceptions (or anything that requires unwind info records) on macOS.
Fixes #12992
Fixes #13985