samples: add Terra samples

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

samples/Terra/class5.t

@@ -0,0 +1,54 @@
+
+IO = terralib.includec("stdio.h")
+local Class = require("lib/javalike")
+
+struct A {
+  a : int;
+  bb : &B
+} and struct B {
+  b : int;
+  aa : &A
+} 
+Class.extends(B,A)
+
+
+terra A:times2() : int
+    return self.a*2
+end
+    
+terra B:combine(a : int) : int
+    return self.b + self.a + a
+end
+    
+
+struct C {
+  c : double
+}
+Class.extends(C,B)
+
+terra C:combine(a : int) : int
+    return self.c + self.a + self.b + a
+end
+terra C:times2() : double
+    return self.a * 4
+end
+
+terra doubleAnA(a : &A)
+    return a:times2()
+end
+
+terra combineAB(b : &B)
+    return b:combine(3)
+end
+
+terra returnA(a : A)
+    return a
+end
+terra foobar1()
+  var c = C.alloc()
+  c.a,c.b,c.c = 1,2,3.5
+  return c:times2()
+end
+
+assert(foobar1() == 4)
+