Revert "Add prefix based function layout when profile is available."

This reverts commit r261582, since this bot has been broken for four
hours:
http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental_check/19399/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261604 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed