Revert "[PGO] Fix name encoding for ObjC-like functions"

This reverts commit r264587. Reverting to investigate 6 unexpected
failures on the ppc bot:

http://lab.llvm.org:8011/builders/clang-ppc64be-linux/builds/2822

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264590 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed