perf parse: Factor out parse_groups() function

Factor out the parse_groups function, it will be used for new test
interface coming in following changes.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200602214741.1218986-6-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/metricgroup.c

@@ -709,14 +709,12 @@ static void metricgroup__free_egroups(struct list_head *group_list)
 	}
 }
 
-int metricgroup__parse_groups(const struct option *opt,
-			      const char *str,
-			      bool metric_no_group,
-			      bool metric_no_merge,
-			      struct rblist *metric_events)
+static int parse_groups(struct evlist *perf_evlist, const char *str,
+			bool metric_no_group,
+			bool metric_no_merge,
+			struct rblist *metric_events)
 {
 	struct parse_events_error parse_error;
-	struct evlist *perf_evlist = *(struct evlist **)opt->value;
 	struct strbuf extra_events;
 	LIST_HEAD(group_list);
 	int ret;
@@ -742,6 +740,18 @@ int metricgroup__parse_groups(const struct option *opt,
 	return ret;
 }
 
+int metricgroup__parse_groups(const struct option *opt,
+			      const char *str,
+			      bool metric_no_group,
+			      bool metric_no_merge,
+			      struct rblist *metric_events)
+{
+	struct evlist *perf_evlist = *(struct evlist **)opt->value;
+
+	return parse_groups(perf_evlist, str, metric_no_group,
+			    metric_no_merge, metric_events);
+}
+
 bool metricgroup__has_metric(const char *metric)
 {
 	struct pmu_events_map *map = perf_pmu__find_map(NULL);