samples: add Terra samples

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

samples/Terra/cnamespaces.t

@@ -0,0 +1,32 @@
+C,T = terralib.includecstring [[
+	
+	struct Foo {
+		int a;
+	};
+	typedef int Foo;
+	typedef struct Foo * Bar;
+	typedef Foo * Bar2;
+	Bar bar(struct Foo * a, Bar2 b) { return (Bar)0; }
+]]
+
+terra what()
+	var f  = T.Foo { 3 }
+	var a : C.Bar = &f
+	return a.a
+end
+
+assert(3 == what())
+
+C,T = terralib.includecstring [[
+	typedef struct { int a; } Foo;
+	typedef Foo * FooPtr;
+	int returna(FooPtr a) { return a->a; }
+]]
+
+terra what2()
+	var a : C.Foo = C.Foo { 3 }
+	var ap : C.FooPtr = &a
+	return C.returna(ap)
+end
+
+assert(3 == what2())