[Intepreter] Don't throw reference errors for globals in typeof.

src/interpreter/bytecode-generator.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INTERPRETER_BYTECODE_GENERATOR_H_
 #define V8_INTERPRETER_BYTECODE_GENERATOR_H_
 
 #include "src/ast.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 42 matching lines @@
   void VisitTypeOf(UnaryOperation* expr);
   void VisitNot(UnaryOperation* expr);
   void VisitDelete(UnaryOperation* expr);
 
   // Helper visitors which perform common operations.
   Register VisitArguments(ZoneList<Expression*>* arguments);
 
   void VisitPropertyLoad(Register obj, Property* expr);
   void VisitPropertyLoadForAccumulator(Register obj, Property* expr);
 
-  void VisitVariableLoad(Variable* variable, FeedbackVectorSlot slot);
-  void VisitVariableLoadForAccumulatorValue(Variable* variable,
-                                            FeedbackVectorSlot slot);
-  MUST_USE_RESULT Register VisitVariableLoadForRegisterValue(
-      Variable* variable, FeedbackVectorSlot slot);
+  void VisitVariableLoad(Variable* variable, FeedbackVectorSlot slot,
+                         TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
+  void VisitVariableLoadForAccumulatorValue(
+      Variable* variable, FeedbackVectorSlot slot,
+      TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
+  MUST_USE_RESULT Register
+  VisitVariableLoadForRegisterValue(Variable* variable, FeedbackVectorSlot slot,
+                                    TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
   void VisitVariableAssignment(Variable* variable, FeedbackVectorSlot slot);
 
   void VisitArgumentsObject(Variable* variable);
   void VisitThisFunctionVariable(Variable* variable);
   void VisitNewTargetVariable(Variable* variable);
   void VisitNewLocalFunctionContext();
   void VisitBuildLocalActivationContext();
   void VisitNewLocalBlockContext(Scope* scope);
   void VisitFunctionClosureForContext();
   void VisitSetHomeObject(Register value, Register home_object,
@@ skipping 58 matching lines @@
 
   int binary_expression_depth_;
   ZoneSet<int> binary_expression_hazard_set_;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GENERATOR_H_