[Interpreter] No need to read/return a value in GeneratorClose.

src/interpreter/interpreter-intrinsics-generator.cc

 // Copyright 2017 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.
 
 #include "src/interpreter/interpreter-intrinsics-generator.h"
 
 #include "src/allocation.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/frames.h"
@@ skipping 419 matching lines @@
   Node* generator = __ LoadRegister(args_reg);
   Node* const value =
       __ LoadObjectField(generator, JSGeneratorObject::kResumeModeOffset);
 
   return value;
 }
 
 Node* IntrinsicsGenerator::GeneratorClose(Node* args_reg, Node* arg_count,
                                           Node* context) {
   Node* generator = __ LoadRegister(args_reg);
-  Node* const value =
-      __ LoadObjectField(generator, JSGeneratorObject::kResumeModeOffset);
   __ StoreObjectFieldNoWriteBarrier(
       generator, JSGeneratorObject::kContinuationOffset,
       __ SmiConstant(JSGeneratorObject::kGeneratorClosed));
-
-  return value;
+  return __ UndefinedConstant();
 }
 
 Node* IntrinsicsGenerator::AsyncGeneratorReject(Node* input, Node* arg_count,
                                                 Node* context) {
   return IntrinsicAsBuiltinCall(input, context,
                                 Builtins::kAsyncGeneratorReject);
 }
 
 Node* IntrinsicsGenerator::AsyncGeneratorResolve(Node* input, Node* arg_count,
                                                  Node* context) {
   return IntrinsicAsBuiltinCall(input, context,
                                 Builtins::kAsyncGeneratorResolve);
 }
 
 void IntrinsicsGenerator::AbortIfArgCountMismatch(int expected, Node* actual) {
   InterpreterAssembler::Label match(assembler_);
   Node* comparison = __ Word32Equal(actual, __ Int32Constant(expected));
   __ GotoIf(comparison, &match);
   __ Abort(kWrongArgumentCountForInvokeIntrinsic);
   __ Goto(&match);
   __ BIND(&match);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8