Revert r282235 "[llvm-dwarfdump] - Teach dwarfdump to dump gdb-index section."

It broke BB:
http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/15856

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282238 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed