Revert "Initial implementation of optimization bisect support."

This reverts commit r267022, due to an ASan failure:

  http://lab.llvm.org:8080/green/job/clang-stage2-cmake-RgSan_check/1549

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267115 91177308-0d34-0410-b5e6-96231b3b80d8
98 files changed