[PATCH] D36546: Garbage-collect common symbols.

[Rui Ueyama via Phabricator via llvm-commits]

ruiu created this revision.
Herald added a subscriber: emaste.

Liveness is usually a notion of input sections, but this patch adds
"liveness" bit to common symbols because they don't belong to any
input section.

This patch is based on https://reviews.llvm.org/D36520


https://reviews.llvm.org/D36546

Files:
  lld/ELF/MarkLive.cpp
  lld/ELF/Symbols.cpp
  lld/ELF/Symbols.h
  lld/ELF/SyntheticSections.cpp
  lld/ELF/Writer.cpp
  lld/test/ELF/common-gc.s
  lld/test/ELF/common-gc2.s

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