[turbofan] Properly implement %_ClassOf intrinsic.

src/compiler/opcodes.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_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 #include <iosfwd>
 
 #include "src/globals.h"
@@ skipping 102 matching lines @@
 #define JS_CONVERSION_UNOP_LIST(V) \
   V(JSToBoolean)                   \
   V(JSToInteger)                   \
   V(JSToLength)                    \
   V(JSToName)                      \
   V(JSToNumber)                    \
   V(JSToObject)                    \
   V(JSToString)
 
 #define JS_OTHER_UNOP_LIST(V) \
+  V(JSClassOf)                \
   V(JSTypeOf)
 
 #define JS_SIMPLE_UNOP_LIST(V) \
   JS_CONVERSION_UNOP_LIST(V)   \
   JS_OTHER_UNOP_LIST(V)
 
 #define JS_OBJECT_OP_LIST(V)      \
   V(JSCreate)                     \
   V(JSCreateArguments)            \
   V(JSCreateArray)                \
@@ skipping 675 matching lines @@
   }
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_