Revert "Reapply r185872 now that the address sanitizer has been changed to support this."

This reverts commit r187939. It broke an O0 build of a spec benchmark.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188012 91177308-0d34-0410-b5e6-96231b3b80d8