Review request for JDK-8066751: Remove casts redundant with Java 9 buffer APIs

[Attila Szegedi]

Please review JDK-8066751 "Remove casts redundant with Java 9 buffer APIs" at 
<http://cr.openjdk.java.net/~attila/8066751/webrev.00> for 
<https://bugs.openjdk.java.net/browse/JDK-8066751>

Thanks,
  Attila.