Added support for assignments to global variables in the toplevel code...

src/x64/codegen-x64.h

 // Copyright 2009 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 380 matching lines @@
   // Returns the arguments allocation mode.
   ArgumentsAllocationMode ArgumentsMode() const;
 
   // Store the arguments object and allocate it if necessary.
   Result StoreArgumentsObject(bool initial);
 
   // The following are used by class Reference.
   void LoadReference(Reference* ref);
   void UnloadReference(Reference* ref);
 
-  Operand ContextOperand(Register context, int index) const {
+  static Operand ContextOperand(Register context, int index) {
     return Operand(context, Context::SlotOffset(index));
   }
 
   Operand SlotOperand(Slot* slot, Register tmp);
 
   Operand ContextSlotOperandCheckExtensions(Slot* slot,
                                             Result tmp,
                                             JumpTarget* slow);
 
   // Expressions
-  Operand GlobalObject() const {
+  static Operand GlobalObject() {
     return ContextOperand(rsi, Context::GLOBAL_INDEX);
   }
 
   void LoadCondition(Expression* x,
                      TypeofState typeof_state,
                      ControlDestination* destination,
                      bool force_control);
   void Load(Expression* x, TypeofState typeof_state = NOT_INSIDE_TYPEOF);
   void LoadGlobal();
   void LoadGlobalReceiver();
@@ skipping 186 matching lines @@
   // called from spilled code, because they do not leave the virtual frame
   // in a spilled state.
   bool in_spilled_code_;
 
   static InlineRuntimeLUT kInlineRuntimeLUT[];
 
   friend class VirtualFrame;
   friend class JumpTarget;
   friend class Reference;
   friend class Result;
+  friend class FastCodeGenerator;
 
   friend class CodeGeneratorPatcher;  // Used in test-log-stack-tracer.cc
 
   DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
 };
 
 
 // -------------------------------------------------------------------------
 // Code stubs
 //
@@ skipping 54 matching lines @@
         | FlagBits::encode(flags_)
         | SSE3Bits::encode(use_sse3_);
   }
   void Generate(MacroAssembler* masm);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_H_