[turbofan] Stub for typeof operator.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index c47342e4b0d9976f222231984c53f97f7ff0d8a0..33e945271a680beef05dd9f93d6439a823099288 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -1022,13 +1022,6 @@ Node* Interpreter::BuildUnaryOp(Callable callable,
   return __ CallStub(callable.descriptor(), target, context, accumulator);
 }
 
-void Interpreter::DoUnaryOp(Callable callable,
-                            InterpreterAssembler* assembler) {
-  Node* result = BuildUnaryOp(callable, assembler);
-  __ SetAccumulator(result);
-  __ Dispatch();
-}
-
 template <class Generator>
 void Interpreter::DoUnaryOp(InterpreterAssembler* assembler) {
   Node* value = __ GetAccumulator();
@@ -1141,7 +1134,7 @@ void Interpreter::DoLogicalNot(InterpreterAssembler* assembler) {
 // Load the accumulator with the string representating type of the
 // object in the accumulator.
 void Interpreter::DoTypeOf(InterpreterAssembler* assembler) {
-  DoUnaryOp(CodeFactory::Typeof(isolate_), assembler);
+  DoUnaryOp<TypeofStub>(assembler);
 }
 
 void Interpreter::DoDelete(Runtime::FunctionId function_id,