perf evlist: Add fprintf method

For debugging, etc.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-fjimge1ovgh976qlt8dtmlp0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.h

@@ -143,4 +143,6 @@ static inline struct perf_evsel *perf_evlist__last(struct perf_evlist *evlist)
 {
 	return list_entry(evlist->entries.prev, struct perf_evsel, node);
 }
+
+size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp);
 #endif /* __PERF_EVLIST_H */