Review request for JDK-8149186: Don't use indy for optimistic arithmetic

[Attila Szegedi]

Please review JDK-8149186 "Don't use indy for optimistic arithmetic" at 
<http://cr.openjdk.java.net/~attila/8149186/webrev.jdk9> for 
<https://bugs.openjdk.java.net/browse/JDK-8149186>

Thanks,
  Attila.