Both HGlobalObject and HGlobalReceiver can be replaced with HLoadNamedField.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index c9ef64d0c7c7cd9946fb6b87a38db3f3a23c7490..2c6c3d4ef99fef1fb27edf93aa95688267dee04f 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3504,20 +3504,6 @@ void LCodeGen::DoDeclareGlobals(LDeclareGlobals* instr) {
 }
 
 
-void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
-  Register context = ToRegister(instr->context());
-  Register result = ToRegister(instr->result());
-  __ lw(result, ContextOperand(context, Context::GLOBAL_OBJECT_INDEX));
-}
-
-
-void LCodeGen::DoGlobalReceiver(LGlobalReceiver* instr) {
-  Register global = ToRegister(instr->global_object());
-  Register result = ToRegister(instr->result());
-  __ lw(result, FieldMemOperand(global, GlobalObject::kGlobalReceiverOffset));
-}
-
-
 void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
                                  int formal_parameter_count,
                                  int arity,