Add x64 to the gyp build.

tools/gyp/v8.gyp

 # Copyright 2009 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 34 matching lines @@
         'defines': [
           'V8_TARGET_ARCH_ARM',
         ],
       }],
       ['target_arch=="ia32"', {
         'defines': [
           'V8_TARGET_ARCH_IA32',
           'V8_NATIVE_REGEXP',
         ],
       }],
+      ['target_arch=="x64"', {
+        'defines': [
+          'V8_TARGET_ARCH_X64',
+        ],
+      }],
     ],
     'configurations': {
       'Debug': {
         'defines': [
           'DEBUG',
           '_DEBUG',
           'ENABLE_DISASSEMBLER',
         ],
         'msvs_settings': {
           'VCCLCompilerTool': {
@@ skipping 356 matching lines @@
             '../../src/ia32/macro-assembler-ia32.cc',
             '../../src/ia32/macro-assembler-ia32.h',
             '../../src/ia32/regexp-macro-assembler-ia32.cc',
             '../../src/ia32/regexp-macro-assembler-ia32.h',
             '../../src/ia32/register-allocator-ia32.cc',
             '../../src/ia32/stub-cache-ia32.cc',
             '../../src/ia32/virtual-frame-ia32.cc',
             '../../src/ia32/virtual-frame-ia32.h',
           ],
         }],
+        ['target_arch=="x64"', {
+          'include_dirs+': [
+            '../../src/x64',
+          ],
+          'sources': [
+            '../../src/x64/assembler-x64-inl.h',
+            '../../src/x64/assembler-x64.cc',
+            '../../src/x64/assembler-x64.h',
+            '../../src/x64/builtins-x64.cc',
+            '../../src/x64/codegen-x64.cc',
+            '../../src/x64/codegen-x64.h',
+            '../../src/x64/cpu-x64.cc',
+            '../../src/x64/debug-x64.cc',
+            '../../src/x64/disasm-x64.cc',
+            '../../src/x64/frames-x64.cc',
+            '../../src/x64/frames-x64.h',
+            '../../src/x64/ic-x64.cc',
+            '../../src/x64/jump-target-x64.cc',
+            '../../src/x64/macro-assembler-x64.cc',
+            '../../src/x64/macro-assembler-x64.h',
+            #'../../src/x64/regexp-macro-assembler-x64.cc',
+            #'../../src/x64/regexp-macro-assembler-x64.h',
+            '../../src/x64/register-allocator-x64.cc',
+            '../../src/x64/stub-cache-x64.cc',
+            '../../src/x64/virtual-frame-x64.cc',
+            '../../src/x64/virtual-frame-x64.h',
+          ],
+        }],
         ['OS=="linux"', {
             'link_settings': {
               'libraries': [
                 # Needed for clock_gettime() used by src/platform-linux.cc.
                 '-lrt',
             ]},
             'sources': [
               '../../src/platform-linux.cc',
               '../../src/platform-posix.cc'
             ],
@@ skipping 87 matching lines @@
       ],
       'conditions': [
         [ 'OS=="win"', {
           # This could be gotten by not setting chromium_code, if that's OK.
           'defines': ['_CRT_SECURE_NO_WARNINGS'],
         }],
       ],
     },
   ],
 }