tracer: Make bb_seen static

bb_seen is not used outside of tracer.c.


	* tracer.c (bb_seen): Make static.

From-SVN: r235585

gcc/ChangeLog

+2016-04-28  Segher Boesssenkool  <segher@kernel.crashing.org>
+
+	* tracer.c (bb_seen): Make static.
+
 2016-04-28  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* common/config/arc/arc-common.c (arc_handle_option): Add NPS400

gcc/tracer.c

@@ -65,7 +65,7 @@ static int branch_ratio_cutoff;
 
 /* A bit BB->index is set if BB has already been seen, i.e. it is
    connected to some trace already.  */
-sbitmap bb_seen;
+static sbitmap bb_seen;
 
 static inline void
 mark_bb_seen (basic_block bb)