RFR: 8038332: Added trace event vm/class/define

[Max Ockner]

Hello,

After some extended brainstorming with Karen, Marcus Hirt, and Eric 
Gahlin, we have decided to pursue a cleaner solution for this bug. The 
original issue suggests that the vm/class/load event should fire during 
JVM_DefineClass*, but it was difficult to think of a solution with no 
duplicates or omitted events. We settled on adding a new vm/class/define 
event which is fired on updates to SystemDictionary.

Webrev: http://cr.openjdk.java.net/~mockner/8038332.04/

Thanks,
Max