RFR (XS): 8028037: "[parfait] warnings from b114 for hotspot.src.share.vm "

[David Chase]

Bug: https://bugs.openjdk.java.net/browse/JDK-8028037
Fix: http://cr.openjdk.java.net/~drchase/8028037/webrev.00/

Testing: local jtreg.

The fix addresses half of the bug, inserting a null check to keep Parfait happy.  The logic to ensure that the null cannot happen is a little convoluted and split across two places.

The other half of the bug is addressed (separately, by other people) with an addition to the Parfait configuration files so that report_vm_error is treated as an exit (which it is except for certain cases of debugging).


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