samples: add Terra samples

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

samples/Terra/malloc.t

@@ -0,0 +1,23 @@
+local c = terralib.includecstring [[
+	#include <stdlib.h>
+	#include <stdio.h>
+]]
+
+local N = 10
+terra foo()
+	c.printf("size = %d\n",int(sizeof(int)))
+	var list = [&int](c.malloc(sizeof(int)*N))
+	for i = 0,N do
+		list[i] = i + 1
+	end
+	var result = 0
+	for i = 0,N do
+		c.printf("%d = %d\n",int(i),list[i])
+		result = result + list[i]
+	end
+	c.free([&uint8](list))
+	return result
+end
+
+local test = require("test")
+test.eq(foo(),N*(1 + N)/2)