[turbofan] Properly represent the float64 hole.

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 8821 matching lines @@
   int index_;
 };
 
 
 // The Oddball describes objects null, undefined, true, and false.
 class Oddball: public HeapObject {
  public:
   // [to_number_raw]: Cached raw to_number computed at startup.
   inline double to_number_raw() const;
   inline void set_to_number_raw(double value);
+  inline void set_to_number_raw_as_bits(uint64_t bits);
 
   // [to_string]: Cached to_string computed at startup.
   DECL_ACCESSORS(to_string, String)
 
   // [to_number]: Cached to_number computed at startup.
   DECL_ACCESSORS(to_number, Object)
 
   // [typeof]: Cached type_of computed at startup.
   DECL_ACCESSORS(type_of, String)
 
@@ skipping 1397 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_