[PATCH] D103979: [lld-macho] Have dead-stripping work with literal sections

[Jez Ng via Phabricator via llvm-commits]

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Literal sections are not atomically live or dead. Rather,
liveness is tracked for each individual literal they contain. CStrings
have their liveness tracked via a `live` bit in StringPiece, and
fixed-width literals have theirs tracked via a BitVector.

The live-marking code now needs to track the offset within each section
that is to be marked live, in order to identify the literal at that
particular offset.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103979

Files:
  lld/MachO/InputSection.cpp
  lld/MachO/InputSection.h
  lld/MachO/MarkLive.cpp
  lld/MachO/SyntheticSections.cpp
  lld/test/MachO/dead-strip.s

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