Mark Johnston 4538cee5bf Allow tracing of functions prefixed by "__".
This restriction was inherited from upstream but is not relevant on FreeBSD.
Furthermore, it hindered the tracing of locking primitive subroutines.

MFC after:	1 week
2016-10-02 00:35:00 +00:00
..
2016-08-06 15:06:19 +00:00