Request for Review (s) - 8154743: Internal Error: psParallelCompact.hpp assert(addr >= _region_start) failed: bad addr

[Jon Masamitsu]

8154743: Internal Error: psParallelCompact.hpp assert(addr >= 
_region_start) failed: bad addr
https://bugs.openjdk.java.net/browse/JDK-8154743

ParallelGC summarizes liveness information (among other things) into
regions for parallel compaction.  It allows the calculation of the region
index for the region just beyond the end of the heap but should not
access that region.  One of the printing methods mistakenly did.

One line fix + more detail on a couple of the asserts + a test

http://cr.openjdk.java.net/~jmasa/8154743/webrev.00/

Tested with new test and with gc_test_suite (in progress) and 
-Xlog:all=trace.

Thanks.

Jon
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