Fix for issue 545: don't reuse this VariableProxy.

src/scopes.cc

Index: src/scopes.cc
diff --git a/src/scopes.cc b/src/scopes.cc
index 7da06cdbc03389544ac4f80b86dde5b0c878d9d9..a47d3730a36a491f8de4c638aa3d48fafc51de50 100644
--- a/src/scopes.cc
+++ b/src/scopes.cc
@@ -189,8 +189,7 @@ void Scope::Initialize(bool inside_with) {
       variables_.Declare(this, Factory::this_symbol(), Variable::VAR,
                          false, Variable::THIS);
   var->rewrite_ = new Slot(var, Slot::PARAMETER, -1);
-  receiver_ = new VariableProxy(Factory::this_symbol(), true, false);
-  receiver_->BindTo(var);
+  receiver_ = var;
 
   if (is_function_scope()) {
     // Declare 'arguments' variable which exists in all functions.