Allow new CPU profiling subsystem to coexist nicely with the old one.

SConstruct

 # Copyright 2010 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 677 matching lines @@
     'default': 'off',
     'help': 'enable heap protection'
   },
   'profilingsupport': {
     'values': ['on', 'off'],
     'default': 'on',
     'help': 'enable profiling of JavaScript code'
   },
   'cppprofilesprocessor': {
     'values': ['on', 'off'],
-    'default': 'off',
+    'default': 'on',
     'help': 'enable C++ profiles processor'
   },
   'debuggersupport': {
     'values': ['on', 'off'],
     'default': 'on',
     'help': 'enable debugging of JavaScript code'
   },
   'soname': {
     'values': ['on', 'off'],
     'default': 'off',
@@ skipping 411 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()