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

runtime/vm/zone.h

-// 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.
 
 #ifndef VM_ZONE_H_
 #define VM_ZONE_H_
 
+#include "platform/utils.h"
 #include "vm/allocation.h"
 #include "vm/handles.h"
 #include "vm/memory_region.h"
-#include "vm/utils.h"
 
 namespace dart {
 
 // Zones support very fast allocation of small chunks of memory. The
 // chunks cannot be deallocated individually, but instead zones
 // support deallocating all chunks in one fast operation.
 
 class BaseZone {
  private:
   BaseZone();
@@ skipping 133 matching lines @@
   }
 
   // Check that the result has the proper alignment and return it.
   ASSERT(Utils::IsAligned(result, kAlignment));
   return result;
 }
 
 }  // namespace dart
 
 #endif  // VM_ZONE_H_