Revert r284371 "[Object/ELF] - Check that e_shnum is null when e_shoff is."

It broke build bot:
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/908/steps/test-stage1-compiler/logs/stdio

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284373 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed