[PATCH] D103977: [lld-macho][nfc] Move liveness-tracking fields into ConcatInputSection

[Jez Ng via Phabricator via llvm-commits]

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These fields currently live in the parent InputSection class,
but they should be specific to ConcatInputSection, since the other
InputSection classes (that contain literals) aren't atomically live or
dead -- rather their component string/int literals should have
individual liveness states. (An upcoming diff will add liveness bits for
StringPieces and fixed-sized literals.)

I also factored out some asserts for isCoalescedWeak() in MarkLive.cpp.
We now avoid putting coalesced sections in the `inputSections` vector,
so we don't have to check/assert against it everywhere.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103977

Files:
  lld/MachO/Driver.cpp
  lld/MachO/InputSection.h
  lld/MachO/MarkLive.cpp
  lld/MachO/SymbolTable.cpp
  lld/MachO/Symbols.cpp
  lld/MachO/Symbols.h
  lld/MachO/UnwindInfoSection.cpp
  lld/MachO/UnwindInfoSection.h
  lld/MachO/Writer.cpp

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