samples: add Terra samples

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

samples/Terra/printfarray.t

@@ -0,0 +1,12 @@
+
+
+C = terralib.includec("stdio.h")
+
+terra char(a : &int8) : int8
+	return a[0]
+end
+terra foobar()
+	var a = arrayof(int8,char("a"),0)
+	C.printf("%s\n",a)
+end
+foobar()