Loading ifc.ifc_buf using the new tor_free() causes undefined behaviour on x86_64 macOS
On macOS x86+64, the new tor_free() from #24337 (moved) loads ifc.ifc_buf, which leads to undefined behaviour. ifc.ifc_buf is a
char * which should be aligned to a multiple 8 bytes, but it is always aligned at 8-bytes (ifc on the stack) plus 4 bytes (ifc_len and pragma pack(4)).
This bug was caused by #24337 (moved), which has been merged to master (0.3.3.0-alpha-dev), and Apple's 32/64 bit kernel data structure compatibility code.
It was discovered using our unit tests and clang's address sanitizer.