Port some more code to x64

syzygy/syzygy.gypi

 # Copyright 2012 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 136 matching lines @@
         ],
       },
       'Coverage': {
         'inherit_from': ['Common_Base', 'x86_Base', 'Coverage_Base'],
       },
       'Debug': {
         'defines': [
           'BUILD_OUTPUT_DIR="<(output_dir_prefix)/Debug"',
          ],
       },
+      'Debug_x64': {
+        'defines': [
+          'BUILD_OUTPUT_DIR="<(output_dir_prefix)/Debug_x64"',
+         ],
+      },
       'conditions': [
         ['OS=="win"', {
           'Coverage_x64': {
             'inherit_from': ['Common_Base', 'x64_Base', 'Coverage_Base'],
           },
         }],
       ],
     },
   },
 }