[compiler] Make --debug-code the default in debug builds.

tools/run-deopt-fuzzer.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 42 matching lines @@
 
 ARCH_GUESS = utils.DefaultArch()
 DEFAULT_TESTS = ["mjsunit", "webkit"]
 TIMEOUT_DEFAULT = 60
 TIMEOUT_SCALEFACTOR = {"debug"   : 4,
                        "release" : 1 }
 
 MODE_FLAGS = {
     "debug"   : ["--nohard-abort", "--nodead-code-elimination",
                  "--nofold-constants", "--enable-slow-asserts",
-                 "--debug-code", "--verify-heap",
-                 "--noconcurrent-recompilation"],
+                 "--verify-heap", "--noconcurrent-recompilation"],
     "release" : ["--nohard-abort", "--nodead-code-elimination",
                  "--nofold-constants", "--noconcurrent-recompilation"]}
 
 SUPPORTED_ARCHS = ["android_arm",
                    "android_ia32",
                    "arm",
                    "ia32",
                    "ppc",
                    "ppc64",
                    "s390",
@@ skipping 409 matching lines @@
   print(">>> Deopt fuzzing phase (%d test cases)" % num_tests)
   progress_indicator = progress.PROGRESS_INDICATORS[options.progress]()
   runner = execution.Runner(suites, progress_indicator, ctx)
 
   code = runner.Run(options.j)
   return exit_code or code
 
 
 if __name__ == "__main__":
   sys.exit(Main())