Add Nanos6 rt test with several tasks

test/rt/nanos6/CMakeLists.txt

@@ -8,3 +8,4 @@ endfunction()
 
 nanos6_rt_test(simple-task.c)
 nanos6_rt_test(nested-task.c)
+nanos6_rt_test(several-tasks.c)

test/rt/nanos6/several-tasks.c

@@ -0,0 +1,14 @@
+int main(void)
+{
+	for(int i = 0; i < 10000; i++)
+	{
+		#pragma oss task
+		{
+			for(volatile long j = 0; j < 1000000L; j++)
+			{
+			}
+		}
+	}
+	#pragma oss taskwait
+	return 0;
+}