Review request for JDK-8139931: Introduce Operation objects in Dynalink instead of string encoding

[Attila Szegedi]

Please review JDK-8139931 "Introduce Operation objects in Dynalink instead of 
string encoding" at <http://cr.openjdk.java.net/~attila/8139931/webrev.jdk9> 
for <https://bugs.openjdk.java.net/browse/JDK-8139931>

This is admittedly a big one. It is also the last in the pipeline of the 
internal Dynalink cleanups, so we’ve reached the end of that!

Thanks,
  Attila.