[turbofan] First step towards sanitizing for-in and making it optimizable.

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 816 matching lines @@
         '../../src/rewriter.cc',
         '../../src/rewriter.h',
         '../../src/runtime-profiler.cc',
         '../../src/runtime-profiler.h',
         '../../src/runtime/runtime-array.cc',
         '../../src/runtime/runtime-classes.cc',
         '../../src/runtime/runtime-collections.cc',
         '../../src/runtime/runtime-compiler.cc',
         '../../src/runtime/runtime-date.cc',
         '../../src/runtime/runtime-debug.cc',
+        '../../src/runtime/runtime-forin.cc',
         '../../src/runtime/runtime-function.cc',
         '../../src/runtime/runtime-generator.cc',
         '../../src/runtime/runtime-i18n.cc',
         '../../src/runtime/runtime-internal.cc',
         '../../src/runtime/runtime-json.cc',
         '../../src/runtime/runtime-literals.cc',
         '../../src/runtime/runtime-liveedit.cc',
         '../../src/runtime/runtime-maths.cc',
         '../../src/runtime/runtime-numbers.cc',
         '../../src/runtime/runtime-object.cc',
@@ skipping 1032 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }