Review request for JDK-8029373: Move PropertyListener functionality out of PropertyMap

[Hannes Wallnoefer]

Please review JDK-8029373: Move PropertyListener functionality out of 
PropertyMap.

http://cr.openjdk.java.net/~hannesw/8029373/

This is for the JDK9 repo. It moves SwitchPoint invalidation out of 
PropertyMap, which should make PropertyMaps reusable between 
globals/threads. It also causes much less PropertyListeners to be 
registered. On top of normal testing I've looked at debug output and 
heap dumps and it looks fine.

Thanks,
Hannes