samples: add Terra samples

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

samples/Terra/fnptrc.t

@@ -0,0 +1,25 @@
+
+C = terralib.includecstring [[
+	struct Foo {
+		int (*bar)(int);
+	};
+	int runptr(int (*bar)(int), int a) {
+		return bar(a);
+	}
+]]
+
+terra add1(a : int) return a + 1 end
+
+terra what0()
+	return C.runptr(add1,1)
+end
+
+assert(what0() == 2)
+
+terra what()
+	var c : C.Foo
+	c.bar =  add1
+	return c.bar(1)
+end
+
+assert(what() == 2)