Review request for JDK-8130234: Get rid of JSType.isNegativeZero

[Attila Szegedi]

Please review JDK-8130234 "Get rid of JSType.isNegativeZero" at 
<http://cr.openjdk.java.net/~attila/8130234/webrev.jdk9> for 
<https://bugs.openjdk.java.net/browse/JDK-8130234>

Thanks,
  Attila.