8203356: VM Object Allocation Collector can infinite recurse

[JC Beyler]

Hi all,

Could someone review this change:

Webrev: http://cr.openjdk.java.net/~jcbeyler/8203356/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8203356

Basically, if during a callback from a VMObjectAlloc event, the user
provokes a clone, the code would send a new callback and you can recurse
infinitely.

I added a test that fails without the fix and passes now.

Thanks,
Jc
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