[PATCH] D19490: ELF: Teach section GC to also GC shared symbols.

[Peter Collingbourne via llvm-commits]

pcc created this revision.
pcc added reviewers: ruiu, rafael, davide, grimar.
pcc added a subscriber: llvm-commits.

This change also fixes a bug in section GC. We need to treat exported
symbols in all output files as GC roots, not just in DSOs or executables
linked with --export-dynamic.

http://reviews.llvm.org/D19490

Files:
  ELF/InputSection.cpp
  ELF/InputSection.h
  ELF/MarkLive.cpp
  ELF/OutputSections.cpp
  test/ELF/gc-sections-shared.s

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