samples: add Terra samples

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

samples/Terra/new.t

@@ -0,0 +1,14 @@
+local c = terralib.includec("stdlib.h")
+
+new = macro(function(typquote)
+    local typ = typquote:astype()
+    return `[&typ](c.malloc(sizeof(typ)))
+end)
+
+local typ = int
+terra doit()
+    var a : &int = new(int)
+    return a
+end
+
+doit()