samples: add Terra samples

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

samples/Terra/speed.t

@@ -0,0 +1,30 @@
+local c = terralib.includecstring [[ 
+    #include <stdio.h>
+    #include <stdlib.h>
+]]
+
+terra doit(N : int64)
+    var cur,last = 1ULL,1ULL
+    for i = 0ULL, (N-2ULL) do
+        cur,last = cur+last,cur
+    end
+    return cur
+end
+terra main(argc : int, argv : &&int8)
+    var N = 4ULL
+    if argc == 2 then
+        N = c.atoi(argv[1])
+    end
+    var result = doit(N)
+    c.printf("%lld\n",result)
+end
+
+terra what()
+	return c.atoi("54")
+end
+
+local test = require("test")
+print(what())
+print(test.time( function() doit:compile() end))
+print(test.time( function() doit(100000000) end))
+print(test.time( function() terralib.saveobj("speed",{main = main}) end))