samples: add Terra samples

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

samples/Terra/lazycstring.t

@@ -0,0 +1,21 @@
+
+struct A {
+	a : int
+}
+
+
+print(A:cstring())
+
+terra foo()
+	return A { 1 }
+end
+
+struct B {
+	a : int
+}
+
+terra foo2()
+	return B { 1 }
+end
+
+assert(foo().a == foo2().a)