Make sure that canonical NaN is also platform NaN.

src/v8globals.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 491 matching lines @@
 // Used to specify whether a receiver is implicitly or explicitly
 // provided to a call.
 enum CallKind {
   CALL_AS_METHOD = 0,
   CALL_AS_FUNCTION
 };
 
 
 static const uint32_t kHoleNanUpper32 = 0x7FFFFFFF;
 static const uint32_t kHoleNanLower32 = 0xFFFFFFFF;
-static const uint32_t kCanonicalNonHoleNanUpper32 = 0x7FF10000;
-static const uint32_t kCanonicalNonHoleNanLower32 = 0xFFFFFFFF;
 static const uint32_t kNaNOrInfinityLowerBoundUpper32 = 0x7FF00000;
 
 const uint64_t kHoleNanInt64 =
     (static_cast<uint64_t>(kHoleNanUpper32) << 32) | kHoleNanLower32;
-const uint64_t kCanonicalNonHoleNanInt64 =
-    (static_cast<uint64_t>(kCanonicalNonHoleNanUpper32) << 32) |
-        kCanonicalNonHoleNanLower32;
 const uint64_t kLastNonNaNInt64 =
     (static_cast<uint64_t>(kNaNOrInfinityLowerBoundUpper32) << 32);
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_