Revert rL317618

The implemented pass fails and is breaking a large number of unit tests.
Example:
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/5777/steps/build-stage3-compiler/logs/stdio

This reverts commit rL317618

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317641 91177308-0d34-0410-b5e6-96231b3b80d8

Author: hctim