Both HGlobalObject and HGlobalReceiver can be replaced with HLoadNamedField.

src/x64/lithium-x64.h

 // 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 78 matching lines @@
   V(DoubleToI)                                  \
   V(DoubleToSmi)                                \
   V(Drop)                                       \
   V(DummyUse)                                   \
   V(Dummy)                                      \
   V(ElementsKind)                               \
   V(ForInCacheArray)                            \
   V(ForInPrepareMap)                            \
   V(FunctionLiteral)                            \
   V(GetCachedArrayIndex)                        \
-  V(GlobalObject)                               \
-  V(GlobalReceiver)                             \
   V(Goto)                                       \
   V(HasCachedArrayIndexAndBranch)               \
   V(HasInstanceTypeAndBranch)                   \
   V(InnerAllocatedObject)                       \
   V(InstanceOf)                                 \
   V(InstanceOfKnownGlobal)                      \
   V(InstructionGap)                             \
   V(Integer32ToDouble)                          \
   V(Integer32ToSmi)                             \
   V(InvokeFunction)                             \
@@ skipping 1614 matching lines @@
     inputs_[0] = context;
   }
 
   LOperand* context() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(DeclareGlobals, "declare-globals")
   DECLARE_HYDROGEN_ACCESSOR(DeclareGlobals)
 };
 
 
-class LGlobalObject V8_FINAL : public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LGlobalObject(LOperand* context) {
-    inputs_[0] = context;
-  }
-
-  LOperand* context() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
-};
-
-
-class LGlobalReceiver V8_FINAL : public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LGlobalReceiver(LOperand* global_object) {
-    inputs_[0] = global_object;
-  }
-
-  LOperand* global() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(GlobalReceiver, "global-receiver")
-};
-
-
 class LCallJSFunction V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LCallJSFunction(LOperand* function) {
     inputs_[0] = function;
   }
 
   LOperand* function() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(CallJSFunction, "call-js-function")
   DECLARE_HYDROGEN_ACCESSOR(CallJSFunction)
@@ skipping 965 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_