Add link time code generation option to win builder.

build/standalone.gypi

 # 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
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 282 matching lines @@
         'msvs_settings': {
           'VCCLCompilerTool': {
             'MinimalRebuild': 'false',
             'BufferSecurityCheck': 'true',
             'EnableFunctionLevelLinking': 'true',
             'RuntimeTypeInfo': 'false',
             'WarningLevel': '3',
             'WarnAsError': 'true',
             'DebugInformationFormat': '3',
             'Detect64BitPortabilityProblems': 'false',
+            'WholeProgramOptimization': 'false',
             'conditions': [
               [ 'msvs_multi_core_compile', {
                 'AdditionalOptions': ['/MP'],
               }],
               ['component=="shared_library"', {
                 'ExceptionHandling': '1',  # /EHsc
               }, {
                 'ExceptionHandling': '0',
               }],
             ],
           },
           'VCLibrarianTool': {
             'AdditionalOptions': ['/ignore:4221'],
           },
           'VCLinkerTool': {
             'MinimumRequiredVersion': '5.01',  # XP.
             'AdditionalDependencies': [
               'ws2_32.lib',
             ],
             'GenerateDebugInformation': 'true',
             'MapFileName': '$(OutDir)\\$(TargetName).map',
             'ImportLibrary': '$(OutDir)\\lib\\$(TargetName).lib',
             'FixedBaseAddress': '1',
+            #'LinkTimeCodeGeneration': '1',
             # LinkIncremental values:
             #   0 == default
             #   1 == /INCREMENTAL:NO
             #   2 == /INCREMENTAL
             'LinkIncremental': '1',
             # SubSystem values:
             #   0 == not set
             #   1 == /SUBSYSTEM:CONSOLE
             #   2 == /SUBSYSTEM:WINDOWS
             'SubSystem': '1',
@@ skipping 60 matching lines @@
         ],
         'target_conditions': [
           ['_type!="static_library"', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
           }],
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
   ],
 }