Both HGlobalObject and HGlobalReceiver can be replaced with HLoadNamedField.

src/ia32/lithium-codegen-ia32.cc

 // 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 3753 matching lines @@
 
 void LCodeGen::DoDeclareGlobals(LDeclareGlobals* instr) {
   ASSERT(ToRegister(instr->context()).is(esi));
   __ push(esi);  // The context is the first argument.
   __ push(Immediate(instr->hydrogen()->pairs()));
   __ push(Immediate(Smi::FromInt(instr->hydrogen()->flags())));
   CallRuntime(Runtime::kDeclareGlobals, 3, instr);
 }
 
 
-void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
-  Register context = ToRegister(instr->context());
-  Register result = ToRegister(instr->result());
-  __ mov(result,
-         Operand(context, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-}
-
-
-void LCodeGen::DoGlobalReceiver(LGlobalReceiver* instr) {
-  Register global = ToRegister(instr->global());
-  Register result = ToRegister(instr->result());
-  __ mov(result, FieldOperand(global, GlobalObject::kGlobalReceiverOffset));
-}
-
-
 void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
                                  int formal_parameter_count,
                                  int arity,
                                  LInstruction* instr,
                                  EDIState edi_state) {
   bool dont_adapt_arguments =
       formal_parameter_count == SharedFunctionInfo::kDontAdaptArgumentsSentinel;
   bool can_invoke_directly =
       dont_adapt_arguments || formal_parameter_count == arity;
 
@@ skipping 2549 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32