[PATCH] [ELF] LLD does not create a record in the .dynsym if a strong symbol defined in the executable file replaces a weak symbol from a shared library.

[Simon Atanasyan]

Symbols require to be exported is now tagged using an ELFReference.

http://reviews.llvm.org/D4789

Files:
  include/lld/Core/LinkingContext.h
  include/lld/Core/Reference.h
  include/lld/Core/Resolver.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  lib/Core/LinkingContext.cpp
  lib/Driver/Driver.cpp
  lib/ReaderWriter/ELF/Atoms.h
  lib/ReaderWriter/ELF/DefaultTargetHandler.h
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/ELF/ELFResolver.h
  lib/ReaderWriter/ELF/TargetHandler.h
  lib/ReaderWriter/Reader.cpp
  test/elf/X86_64/dynsym-weak.test
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