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

runtime/vm/debuginfo_linux.cc

-// 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.
 
 #include "vm/debuginfo.h"
 
+#include "platform/utils.h"
 #include "vm/gdbjit_linux.h"
 #include "vm/os.h"
-#include "vm/utils.h"
 #include "vm/thread.h"
 
 namespace dart {
 
 // -----------------------------------------------------------------------------
 // Implementation of ElfGen
 //
 // Specification documents:
 //   http://refspecs.freestandards.org
 //
@@ skipping 530 matching lines @@
   delete dynamic_region;
   delete elf_section;
 }
 
 
 void DebugInfo::UnregisterAllSections() {
   ::deleteDynamicSections();
 }
 
 }  // namespace dart