Use pthread_kill(3) instead of kill(2).

Another swing at useful native traces.  pthread_kill(3) uses tkill(2)
instead of kill(2), so we may have a better chance of the signal landing
on the right thread.

For bug 2517042.

Change-Id: I62871c1e21b11442ea52c861397674f1644f4da9
1 file changed