Get rid of obsolete addProfileRT(), generalize the relevant addProfileRTLinux() to all OS

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@201789 91177308-0d34-0410-b5e6-96231b3b80d8
Remove really old "APPLE LOCAL" markers.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@201791 91177308-0d34-0410-b5e6-96231b3b80d8