[PATCH] D38790: [ELF] Do not keep symbols if they referenced only from discarded sections.

[Igor Kudrin via Phabricator via llvm-commits]

ikudrin updated this revision to Diff 124139.
ikudrin added a comment.

- Rebased on the tip.
- This is mostly Rafael's version of the patch.
- Added a check for a weak symbol when setting `IsNeeded`.
- Added the test to check that a weak symbol doesn't cause adding DT_NEEDED; this test might be extracted to a separate patch.


https://reviews.llvm.org/D38790

Files:
  ELF/MarkLive.cpp
  ELF/SymbolTable.cpp
  ELF/Symbols.h
  ELF/Writer.cpp
  test/ELF/Inputs/gc-sections-shared2.s
  test/ELF/gc-collect-undefined.s
  test/ELF/gc-sections-shared.s

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