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

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
===================================================================
--- runtime/vm/flow_graph.h	(revision 17245)
+++ runtime/vm/flow_graph.h	(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.
 
@@ -24,6 +24,11 @@
   explicit BlockIterator(const GrowableArray<BlockEntryInstr*>& block_order)
       : block_order_(block_order), current_(0) { }
 
+  BlockIterator(const BlockIterator& other)
+      : ValueObject(),
+        block_order_(other.block_order_),
+        current_(other.current_) { }
+
   void Advance() {
     ASSERT(!Done());
     current_++;