The LC_DYLD_CHAINED_FIXUPS load command references a new kind of imports
table that is used for binding chained fixups. A similar table may be
reconstructed from the legacy BIND_OPCODE_THREADED info. We now display
these new imports in `ii` instead of the classic undefined symbols and
use them to assign names to relocs.
Objective-C superclass resolution for chained fixups is also changed to
first check for relocs and then for a non-zero address read from memory
instead of ignoring relocs entirely when there is a non-zero value in
memory (this did not work for chained fixups as those already have
non-zero values before patching).
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