samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/aggregatearr.t

@@ -0,0 +1,18 @@
+
+
+a = terralib.new(int[4])
+
+terra foo()
+	a[3] = 4
+end
+
+foo()
+assert(4 == a[3])
+
+
+terra bar()
+	a = array(5,6,7,8)
+end
+
+bar()
+assert(a[3] == 8)