[PATCH] D97057: [lld-macho] Fix and properly test subtractor relocations

[Jez Ng via Phabricator via llvm-commits]

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`llvm-mc` doesn't generate any relocations for subtractions
between local symbols -- they must be global -- so the previous test
wasn't actually testing any relocation logic. I've fixed that and
extended the test to cover r_length=3 relocations as well as both x86_64
and arm64.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97057

Files:
  lld/MachO/Arch/ARM64.cpp
  lld/MachO/Arch/X86_64.cpp
  lld/test/MachO/reloc-subtractor.s
  lld/test/MachO/x86-64-reloc-subtract.s

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