Implement missing features to run Hello world! on simulated ARM.

runtime/bin/gen_snapshot.cc

 // 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 410 matching lines @@
   // This is a generic dart snapshot which needs builtin library setup.
   Dart_Handle library =
       LoadGenericSnapshotCreationScript(Builtin::kBuiltinLibrary);
   VerifyLoaded(library);
 }
 
 
 static void SetupForGenericSnapshotCreation() {
   SetupForUriResolution();
 
-  // TODO(regis): Reenable this code for arm and mips when possible.
-#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
+  // TODO(regis): Reenable this code for mips when possible.
+#if defined(TARGET_ARCH_IA32) ||                                               \
+    defined(TARGET_ARCH_X64) ||                                                \
+    defined(TARGET_ARCH_ARM)
   Dart_Handle library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
   VerifyLoaded(library);
 #endif
 }
 
 
 int main(int argc, char** argv) {
   CommandLineOptions vm_options(argc);
 
   // Initialize the URL mapping array.
@@ skipping 76 matching lines @@
     CreateAndWriteSnapshot();
 
     Dart_EnterIsolate(UriResolverIsolateScope::isolate);
     Dart_ShutdownIsolate();
   } else {
     SetupForGenericSnapshotCreation();
     CreateAndWriteSnapshot();
   }
   return 0;
 }