Don't enable WPO on Win64 and require Server 2003 / x64 for win64

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 772 matching lines @@
             'EnableIntrinsicFunctions': 'true',
             'FavorSizeOrSpeed': '0',
             'StringPooling': 'true',
             'BasicRuntimeChecks': '0',
             'conditions': [
               ['component=="shared_library"', {
                 'RuntimeLibrary': '3',  #/MDd
               }, {
                 'RuntimeLibrary': '1',  #/MTd
               }],
-              ['v8_target_arch=="x64"', {
-                # TODO(2207): remove this option once the bug is fixed.
-                'WholeProgramOptimization': 'true',
-              }],
             ],
           },
           'VCLinkerTool': {
             'LinkIncremental': '1',
             'OptimizeReferences': '2',
             'EnableCOMDATFolding': '2',
           },
         },
         'conditions': [
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" or \
@@ skipping 149 matching lines @@
                 'InlineFunctionExpansion': '2',
                 'EnableIntrinsicFunctions': 'true',
                 'FavorSizeOrSpeed': '0',
                 'StringPooling': 'true',
                 'conditions': [
                   ['component=="shared_library"', {
                     'RuntimeLibrary': '2',  #/MD
                   }, {
                     'RuntimeLibrary': '0',  #/MT
                   }],
-                  ['v8_target_arch=="x64"', {
-                    # TODO(2207): remove this option once the bug is fixed.
-                    'WholeProgramOptimization': 'true',
-                  }],
                 ],
               },
               'VCLinkerTool': {
                 'LinkIncremental': '1',
                 'OptimizeReferences': '2',
                 'EnableCOMDATFolding': '2',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }