samples: add Terra samples

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

samples/Terra/latelink.t

@@ -0,0 +1,24 @@
+C = terralib.includecstring [[
+    typedef struct {
+        int a;
+    } S;
+    typedef struct {
+        S a;
+    } A;
+]]
+C2 = terralib.includecstring [[
+    typedef struct {
+        int a;
+    } S;
+    typedef struct {
+        S a;
+    } B;
+]]
+
+terra second()
+    var a : C2.B
+    var b : C.A
+    
+    a.a = b.a
+end
+second:disas()