Forking the type system between Crankshaft & Turbofan.

src/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 433 matching lines @@
         'assert-scope.h',
         'assert-scope.cc',
         'ast/ast-expression-rewriter.cc',
         'ast/ast-expression-rewriter.h',
         'ast/ast-literal-reindexer.cc',
         'ast/ast-literal-reindexer.h',
         'ast/ast-numbering.cc',
         'ast/ast-numbering.h',
         'ast/ast-traversal-visitor.h',
         'ast/ast-type-bounds.h',
+        'ast/ast-types.cc',
+        'ast/ast-types.h',
         'ast/ast-value-factory.cc',
         'ast/ast-value-factory.h',
         'ast/ast.cc',
         'ast/ast.h',
         'ast/context-slot-cache.cc',
         'ast/context-slot-cache.h',
         'ast/modules.cc',
         'ast/modules.h',
         'ast/prettyprinter.cc',
         'ast/prettyprinter.h',
@@ skipping 1951 matching lines @@
       'conditions': [
         ['want_separate_host_toolset_mkpeephole==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }