Replace examine-threads.c with a similar little utility I wrote a

while back.  By default its output will be less verbose than the
old examine-threads.c but adding the '-v' command line flag will
give all the information that examine-threads.c provided plus some.

Of note, this implementation can take a process name -- and it will
use the libproc API so it can match program names longer than 16
characters.

llvm-svn: 133500