perf tools: Add stat event synthesize function

Introduce the perf_event__synthesize_stat function to synthesize a
'struct stat_event'.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-16-git-send-email-jolsa@kernel.org
[ Renamed 'stat' parameter to 'st' to fix 'already defined' build error with older distros (e.g. RHEL6.7) ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/builtin-test.c

@@ -191,6 +191,10 @@ static struct test generic_tests[] = {
 		.desc = "Test stat config synthesize",
 		.func = test__synthesize_stat_config,
 	},
+	{
+		.desc = "Test stat synthesize",
+		.func = test__synthesize_stat,
+	},
 	{
 		.func = NULL,
 	},