Fix vm code base so that it can be built for --arch=simarm (no snapshot yet).

runtime/bin/gen_snapshot.cc

Index: runtime/bin/gen_snapshot.cc
===================================================================
--- runtime/bin/gen_snapshot.cc	(revision 17245)
+++ runtime/bin/gen_snapshot.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -453,8 +453,11 @@
   VerifyLoaded(library);
   library = LoadGenericSnapshotCreationScript(Builtin::kCryptoLibrary);
   VerifyLoaded(library);
+  // TODO(regis): Reenable this code for arm and mips when possible.
+#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
   library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
   VerifyLoaded(library);
+#endif
 }