Move utils.h and utils.cc from runtime/vm to runtime/platform

runtime/vm/growable_array.h

Index: runtime/vm/growable_array.h
diff --git a/runtime/vm/growable_array.h b/runtime/vm/growable_array.h
index 1175b868a4164044b8ab2490374a1e5475b3743b..692da64a6706664090d878e2e1c58a6d3d798028 100644
--- a/runtime/vm/growable_array.h
+++ b/runtime/vm/growable_array.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 // Defines growable array classes, that differ where they are allocated:
@@ -8,9 +8,9 @@
 #ifndef VM_GROWABLE_ARRAY_H_
 #define VM_GROWABLE_ARRAY_H_
 
+#include "platform/utils.h"
 #include "vm/allocation.h"
 #include "vm/isolate.h"
-#include "vm/utils.h"
 #include "vm/zone.h"
 
 namespace dart {