Added a simple dead code removal phase.

tools/test.py

 #!/usr/bin/env python
 #
 # Copyright 2012 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
@@ skipping 666 matching lines @@
 
   def GetTestStatus(self, context, sections, defs):
     for test in self.tests:
       test.GetTestStatus(context, sections, defs)
 
 
 SUFFIX = {
     'debug'   : '_g',
     'release' : '' }
 FLAGS = {
-    'debug'   : ['--nobreak-on-abort', '--enable-slow-asserts', '--debug-code', '--verify-heap'],
-    'release' : ['--nobreak-on-abort']}
+    'debug'   : ['--nobreak-on-abort', '--nodead-code-elimination',
+                 '--enable-slow-asserts', '--debug-code', '--verify-heap'],
+    'release' : ['--nobreak-on-abort', '--nodead-code-elimination']}
 TIMEOUT_SCALEFACTOR = {
     'debug'   : 4,
     'release' : 1 }
 
 
 class Context(object):
 
   def __init__(self, workspace, buildspace, verbose, vm, timeout, processor, suppress_dialogs, store_unexpected_output):
     self.workspace = workspace
     self.buildspace = buildspace
@@ skipping 847 matching lines @@
     for entry in timed_tests[:20]:
       t = FormatTime(entry.duration)
       sys.stderr.write("%4i (%s) %s\n" % (index, t, entry.GetLabel()))
       index += 1
 
   return result
 
 
 if __name__ == '__main__':
   sys.exit(Main())