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

runtime/bin/gen_snapshot.cc

-// 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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
@@ skipping 434 matching lines @@
 
 
 static void SetupForGenericSnapshotCreation() {
   SetupForUriResolution();
 
   Dart_Handle library =
       LoadGenericSnapshotCreationScript(Builtin::kJsonLibrary);
   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
 }
 
 
 int main(int argc, char** argv) {
   CommandLineOptions vm_options(argc);
 
   // Initialize the URL mapping array.
   CommandLineOptions url_mapping_array(argc);
   url_mapping = &url_mapping_array;
 
@@ skipping 127 matching lines @@
       CreateAndWriteSnapshot(true);
 
       free(snapshot_buffer);
     }
   } else {
     SetupForGenericSnapshotCreation();
     CreateAndWriteSnapshot(false);
   }
   return 0;
 }