Review request for JDK-8038638: Persistent store for compiled scripts

[Hannes Wallnoefer]

Please review JDK-8038638: Persistent store for compiled scripts:
http://cr.openjdk.java.net/~hannesw/8038638/webrev.01/

This adds a --persistent-code-cache/-pcc option to allow storing 
compiled script classes between runs.

Thanks,
Hannes