Revert "[LTO/gold] Support --wrap"

This reverts commit r327459. The new gold plugin interface is not
available with older gold installations, leading to compile failures:
http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/9109/steps/build-stage2-LLVMgold.so/logs/stdio

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327465 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed