K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2014-11-10T14:11:17.123524Z
K 7
svn:log
V 291
When sleeping waiting for the profiling stop, always set P_STOPPROF
before dropping process lock.  Clear P_STOPPROF when doing wakeup.

Both issues caused thread to hang in stopprofclock() "stopprof" sleep.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END