RFR: 8000780 back ported Fix zero fail to build in JDK7u-dev

[Chris Phillips @ T O]

Hi

Attached is a backport (essentially resurrection of the Permgen code)
of 8000780

Please review.

Cheers!
Chris
 PS
Webrev is here:
http://integral-portal.lgonqn.org/temp/ChrisPhi/jdk7u-dev-zero-hs24b25++/



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