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

runtime/vm/disassembler_arm.cc

Index: runtime/vm/disassembler_arm.cc
===================================================================
--- runtime/vm/disassembler_arm.cc	(revision 17245)
+++ runtime/vm/disassembler_arm.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.
 
@@ -20,7 +20,8 @@
 
 void Disassembler::Disassemble(uword start,
                                uword end,
-                               DisassemblyFormatter* formatter) {
+                               DisassemblyFormatter* formatter,
+                               const Code::Comments& comments) {
   UNIMPLEMENTED();
 }