Add optimized compiler support for generic global loads....

src/hydrogen.h

Index: src/hydrogen.h
===================================================================
--- src/hydrogen.h	(revision 5936)
+++ src/hydrogen.h	(working copy)
@@ -690,6 +690,7 @@
   void Bind(Variable* var, HValue* value) { environment()->Bind(var, value); }
 
   void VisitForValue(Expression* expr);
+  void VisitForTypeofValue(Expression* expr);
   void VisitForEffect(Expression* expr);
   void VisitForControl(Expression* expr,
                        HBasicBlock* true_block,
@@ -745,7 +746,8 @@
   // Helpers for flow graph construction.
   void LookupGlobalPropertyCell(VariableProxy* expr,
                                 LookupResult* lookup,
-                                bool is_store);
+                                bool is_store,
+                                bool* use_generic);
 
   bool TryArgumentsAccess(Property* expr);
   bool TryCallApply(Call* expr);
@@ -756,7 +758,7 @@
   void HandleGlobalVariableAssignment(VariableProxy* proxy,
                                       HValue* value,
                                       int position);
-  void HandleGlobalVariableLoad(VariableProxy* expr);
+  void HandleGlobalVariableLoad(VariableProxy* expr, bool inside_typeof);
   void HandlePropertyAssignment(Assignment* expr);
   void HandleCompoundAssignment(Assignment* expr);
   void HandlePolymorphicLoadNamedField(Property* expr,