samples: add Terra samples

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

samples/Terra/defergoto.t

@@ -0,0 +1,35 @@
+C = terralib.includec("stdio.h")
+cur = global(int)
+
+terra d(a : int)
+    if cur ~= a then
+        C.printf("found %d while expecting %d\n",a,cur)
+        error(cur)
+    end
+    cur = cur + 1
+    C.printf("d%d\n",a)
+end
+d:setinlined(false)
+
+terra foo()
+    d(0)
+    defer d(14)
+	var a = 0
+	::begin::
+	defer d(terralib.select(a == 10,13,a + 1))
+	if a >= 10 then
+		defer d(11)
+		goto theend
+	end
+	a = a + 1
+	goto begin
+	::theend::
+	defer d(12)
+	return a
+end
+
+foo:printpretty()
+cur:set(0)
+
+test = require("test")
+test.eq(foo(),10)