X87: enable the X87 turbofan support.

tools/gyp/v8.gyp

 # 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 1092 matching lines @@
             '../../src/x87/lithium-codegen-x87.cc',
             '../../src/x87/lithium-codegen-x87.h',
             '../../src/x87/lithium-gap-resolver-x87.cc',
             '../../src/x87/lithium-gap-resolver-x87.h',
             '../../src/x87/lithium-x87.cc',
             '../../src/x87/lithium-x87.h',
             '../../src/x87/macro-assembler-x87.cc',
             '../../src/x87/macro-assembler-x87.h',
             '../../src/x87/regexp-macro-assembler-x87.cc',
             '../../src/x87/regexp-macro-assembler-x87.h',
+            '../../src/compiler/x87/code-generator-x87.cc',
+            '../../src/compiler/x87/instruction-codes-x87.h',
+            '../../src/compiler/x87/instruction-selector-x87.cc',
+            '../../src/compiler/x87/linkage-x87.cc',
             '../../src/ic/x87/access-compiler-x87.cc',
             '../../src/ic/x87/handler-compiler-x87.cc',
             '../../src/ic/x87/ic-x87.cc',
             '../../src/ic/x87/ic-compiler-x87.cc',
             '../../src/ic/x87/stub-cache-x87.cc',
           ],
         }],
         ['v8_target_arch=="mips" or v8_target_arch=="mipsel"', {
           'sources': [  ### gcmole(arch:mipsel) ###
             '../../src/mips/assembler-mips.cc',
@@ skipping 762 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }