[PATCH] D105641: [lld-macho][nfc] Create OutputSections earlier

[Jez Ng via Phabricator via llvm-commits]

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... and set `InputSection::parent` to point to them. This makes
it possible to run ICF on a set of InputSections that spans multiple
OutputSections, since it can avoid merging across OutputSection
boundaries by comparing the parent pointers. This is what LLD-ELF does.

This is a no-op for now, but it paves the way for having ICF fold e.g.
the unwind info and LSDA sections.

Additionally, it should make it easier to implement the `section$start$`
symbols.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105641

Files:
  lld/MachO/ConcatOutputSection.cpp
  lld/MachO/ConcatOutputSection.h
  lld/MachO/Driver.cpp
  lld/MachO/InputSection.cpp
  lld/MachO/SyntheticSections.cpp
  lld/MachO/SyntheticSections.h
  lld/MachO/UnwindInfoSection.cpp
  lld/MachO/Writer.cpp
  lld/MachO/Writer.h

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