Revert r309252 "[ELF] - Fix missing relocation when linking executable with...

Revert r309252 "[ELF] - Fix missing relocation when linking executable with --unresolved-symbols=ignore-all"

It broke bot:
http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/4231

llvm-svn: 309258