[turbofan] Introduce dedicated ObjectIsNaN operator.

src/compiler/simplified-operator.h

 // Copyright 2014 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_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/base/compiler-specific.h"
@@ skipping 394 matching lines @@
   const Operator* CheckedTaggedToFloat64(CheckTaggedInputMode);
   const Operator* CheckedTaggedToTaggedSigned();
   const Operator* CheckedTaggedToTaggedPointer();
   const Operator* CheckedTruncateTaggedToWord32();
 
   const Operator* CheckFloat64Hole(CheckFloat64HoleMode);
   const Operator* CheckTaggedHole();
   const Operator* ConvertTaggedHoleToUndefined();
 
   const Operator* ObjectIsDetectableCallable();
+  const Operator* ObjectIsNaN();
   const Operator* ObjectIsNonCallable();
   const Operator* ObjectIsNumber();
   const Operator* ObjectIsReceiver();
   const Operator* ObjectIsSmi();
   const Operator* ObjectIsString();
   const Operator* ObjectIsUndetectable();
 
   // new-rest-parameter-elements
   const Operator* NewRestParameterElements(int parameter_count);
 
@@ skipping 42 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_