hg: shenandoah/jdk8u/hotspot: [Backport] Fixed assertion failures when printing heap region to trace output

[zgu at redhat.com]

Changeset: d8f9b38222ae
Author:    zgu
Date:      2017-08-10 11:45 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/d8f9b38222ae

[Backport] Fixed assertion failures when printing heap region to trace output

! src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp
+ test/gc/shenandoah/TestShenandoahWithLogLevel.java