MachO linker: fix handling of ARM64_RELOC_SUBTRACTOR

ARM64_RELOC_SUBTRACTOR relocations are paired with an
AMR64_RELOC_UNSIGNED relocation to implement: addend + sym1 - sym2
The linker was doing it in two steps, basically:
  *addend <- *addend - sym2
  *addend <- *addend + sym1
The first operation was likely to overflow. For example when the
relocation target was 32-bit and both sym1/sym2 were 64-bit addresses.
With the small memory model, (sym1-sym2) would fit in 32 bits but
(*addend-sym2) may not.

Now the linker does it in one step:
  *addend <- *addend + sym1 - sym2

0 files changed, 0 insertions, 0 deletions