uti: Identify uti thread by clone count

--uti-thread-count <count> is added to mcexec.

Change-Id: Id9ec464412a5bb71e4d9e87d05f79de22d35b067

kernel/process.c

@@ -3455,6 +3455,8 @@ void runq_add_thread(struct thread *thread, int cpu_id)
 
 	procfs_create_thread(thread);
 
+	__sync_add_and_fetch(&thread->proc->clone_count, 1);
+	dkprintf("%s: clone_count is %d\n", __FUNCTION__, thread->proc->clone_count);
 	rusage_num_threads_inc();
 #ifdef RUSAGE_DEBUG
 	if (rusage->num_threads == 1) {