Remove DoubleRepresentation from globals.h

src/conversions.h

 // Copyright 2011 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_CONVERSIONS_H_
 #define V8_CONVERSIONS_H_
 
 #include <limits>
 
 #include "src/base/logging.h"
@@ skipping 131 matching lines @@
 
 // Additional number to string conversions for the number type.
 // The caller is responsible for calling free on the returned pointer.
 char* DoubleToFixedCString(double value, int f);
 char* DoubleToExponentialCString(double value, int f);
 char* DoubleToPrecisionCString(double value, int f);
 char* DoubleToRadixCString(double value, int radix);
 
 
 static inline bool IsMinusZero(double value) {
-  static const DoubleRepresentation minus_zero(-0.0);
-  return DoubleRepresentation(value) == minus_zero;
+  return bit_cast<int64_t>(value) == bit_cast<int64_t>(-0.0);
 }
 
 
 inline bool IsSmiDouble(double value);
 
 
 // Integer32 is an integer that can be represented as a signed 32-bit
 // integer. It has to be in the range [-2^31, 2^31 - 1].
 // We also have to check for negative 0 as it is not an Integer32.
 inline bool IsInt32Double(double value);
@@ skipping 21 matching lines @@
 inline size_t NumberToSize(Isolate* isolate, Object* number);
 
 
 // returns DoubleToString(StringToDouble(string)) == string
 bool IsSpecialIndex(UnicodeCache* unicode_cache, String* string);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONVERSIONS_H_