perf thread_map: Make new_by_tid_str constructor public

It will be used in following patch.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/thread_map.c

···
 	return threads;
 }
 
-static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
+struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
 {
 	struct thread_map *threads = NULL, *nt;
 	int ntasks = 0;

tools/perf/util/thread_map.h

···
 struct thread_map *thread_map__new_str(const char *pid,
 		const char *tid, uid_t uid);
 
+struct thread_map *thread_map__new_by_tid_str(const char *tid_str);
+
 size_t thread_map__fprintf(struct thread_map *threads, FILE *fp);
 
 static inline int thread_map__nr(struct thread_map *threads)