libperf: Add perf_thread_map__nr/perf_thread_map__pid functions

So it's part of libperf library as basic functions operating on
perf_thread_map objects.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190822111141.25823-6-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index e957b87..9b93dde 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1906,7 +1906,7 @@ static struct scripting_ops	*scripting_ops;
 
 static void __process_stat(struct evsel *counter, u64 tstamp)
 {
-	int nthreads = thread_map__nr(counter->core.threads);
+	int nthreads = perf_thread_map__nr(counter->core.threads);
 	int ncpus = perf_evsel__nr_cpus(counter);
 	int cpu, thread;
 	static int header_printed;
@@ -1928,7 +1928,7 @@ static void __process_stat(struct evsel *counter, u64 tstamp)
 
 			printf("%3d %8d %15" PRIu64 " %15" PRIu64 " %15" PRIu64 " %15" PRIu64 " %s\n",
 				counter->core.cpus->map[cpu],
-				thread_map__pid(counter->core.threads, thread),
+				perf_thread_map__pid(counter->core.threads, thread),
 				counts->val,
 				counts->ena,
 				counts->run,