Implement simple fast-path code for functions containing this property stores and global variables.

src/data-flow.h

 // Copyright 2010 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 20 matching lines @@
 #include "ast.h"
 #include "scopes.h"
 
 namespace v8 {
 namespace internal {
 
 // This class is used to number all expressions in the AST according to
 // their evaluation order (post-order left-to-right traversal).
 class AstLabeler: public AstVisitor {
  public:
-  AstLabeler() : next_number_(0) {}
+  AstLabeler() : next_number_(0), has_this_properties_(false) {}
 
   void Label(FunctionLiteral* fun);
 
+  bool has_this_properties() { return has_this_properties_; }
+
  private:
   void VisitDeclarations(ZoneList<Declaration*>* decls);
   void VisitStatements(ZoneList<Statement*>* stmts);
 
   // AST node visit functions.
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   // Traversal number for labelling AST nodes.
   int next_number_;
 
+  bool has_this_properties_;
+
   DISALLOW_COPY_AND_ASSIGN(AstLabeler);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DATAFLOW_H_