[turbofan] Introduce dedicated ObjectIsNaN operator.

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 315 matching lines @@
   V(Allocate)                       \
   V(LoadField)                      \
   V(LoadBuffer)                     \
   V(LoadElement)                    \
   V(LoadTypedElement)               \
   V(StoreField)                     \
   V(StoreBuffer)                    \
   V(StoreElement)                   \
   V(StoreTypedElement)              \
   V(ObjectIsDetectableCallable)     \
+  V(ObjectIsNaN)                    \
   V(ObjectIsNonCallable)            \
   V(ObjectIsNumber)                 \
   V(ObjectIsReceiver)               \
   V(ObjectIsSmi)                    \
   V(ObjectIsString)                 \
   V(ObjectIsUndetectable)           \
   V(ArgumentsFrame)                 \
   V(ArgumentsLength)                \
   V(NewUnmappedArgumentsElements)   \
   V(ArrayBufferWasNeutered)         \
@@ skipping 442 matching lines @@
   }
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_