[turbofan] Properly implement %_ClassOf intrinsic.

src/compiler/js-operator.h

 // Copyright 2013 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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
 #include "src/runtime/runtime.h"
@@ skipping 572 matching lines @@
   const Operator* StoreGlobal(LanguageMode language_mode,
                               const Handle<Name>& name,
                               const VectorSlotPair& feedback);
 
   const Operator* LoadContext(size_t depth, size_t index, bool immutable);
   const Operator* StoreContext(size_t depth, size_t index);
 
   const Operator* LoadModule(int32_t cell_index);
   const Operator* StoreModule(int32_t cell_index);
 
+  const Operator* ClassOf();
   const Operator* TypeOf();
   const Operator* InstanceOf();
   const Operator* OrdinaryHasInstance();
 
   const Operator* ForInNext();
   const Operator* ForInPrepare();
 
   const Operator* LoadMessage();
   const Operator* StoreMessage();
 
@@ skipping 21 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_