Define DEBUG for v8_optimized_debug=2

build/toolchain.gypi

 # Copyright 2013 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 515 matching lines @@
                   '-Os',
                 ],
                 'cflags': [
                   '-fdata-sections',
                   '-ffunction-sections',
                 ],
               }],
               ['v8_optimized_debug==1', {
                 'cflags!': [
                   '-O0',
-                  '-O3', # TODO(2807) should be -O1.
+                  '-O1',
                   '-O2',
                   '-Os',
                 ],
                 'cflags': [
                   '-fdata-sections',
                   '-ffunction-sections',
-                  '-O1', # TODO(2807) should be -O3.
+                  '-O3'
                 ],
+                'defines': [
+                  'OPTIMIZED_DEBUG'
+                ]
               }],
               ['v8_optimized_debug==2', {
                 'cflags!': [
                   '-O0',
                   '-O1',
                   '-Os',
                 ],
                 'cflags': [
                   '-fdata-sections',
                   '-ffunction-sections',
@@ skipping 132 matching lines @@
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }