[PATCH] D112878: [MachO] Properly reset global state

[Shoaib Meenai via Phabricator via llvm-commits]

smeenai created this revision.
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We need to reset global state between runs, similar to the other ports.
There's some file-static state which needs to be reset as well and we
need to add some new helpers for that.

With this change, most LLD Mach-O tests pass with `LLD_IN_TEST=2` (which
runs the linker twice on each test). Some tests will be fixed by the
remainder of this stack, and the rest are fundamentally incompatible
with that mode (e.g. they intentionally throw fatal errors).

Fixes PR52070.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D112878

Files:
  lld/MachO/Driver.cpp
  lld/MachO/Driver.h
  lld/MachO/DriverUtils.cpp
  lld/MachO/InputFiles.h
  lld/MachO/OutputSegment.cpp
  lld/MachO/OutputSegment.h
  lld/MachO/Writer.cpp
  lld/MachO/Writer.h

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