[strong] make --use-strong flag work in d8

test/mjsunit/strong/use-strong-flag.js

Index: test/mjsunit/strong/use-strong-flag.js
diff --git a/test/mjsunit/strong/use-strong-flag.js b/test/mjsunit/strong/use-strong-flag.js
new file mode 100644
index 0000000000000000000000000000000000000000..b1067b8f0df50dc24a092d829a10ce9d4d600708
--- /dev/null
+++ b/test/mjsunit/strong/use-strong-flag.js
@@ -0,0 +1,11 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --use-strong
+
+// Check that d8 still works with the flag.
+
+// ...and that the flag is active.
+// TODO(rossberg): use something that doesn't require eval.
+assertThrows("0 == 0", SyntaxError);