I had originally made the handler function pointers a static internal detail,...

I had originally made the handler function pointers a static internal detail, not accessible to the outside world.  I did this because they must be accessed in a thread-safe manner, and the library provides thread-safe getters and setters for these.  However I am at least temporarily making them public and giving them the Apple-extension names.  In the future these may disappear again, and I think that would probably be a good idea.

llvm-svn: 151256