Request for review (s) - 8145031: Add regression test for 8133023

[Jon Masamitsu]

The cause of the failure in 8133023 was the calculation of the 
ParallelGCThreads using
information that had not yet been initialized. Add a test that checks 
that, after full
initialization, the fresh calculation of ParallelGCThreads is consistent 
with the value
calculated earlier.

http://cr.openjdk.java.net/~jmasa/8145031/webrev.00/

CR: https://bugs.openjdk.java.net/browse/JDK-8145031

Tested with and without the fix for 8133023.

Thanks.

Jon
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