hg: jdk/submit: 8212181: ZGC: Fix incorrect root iteration in ZHeapIterator

[per.liden at oracle.com]

Changeset: 5a2af44ecb83
Author:    pliden
Date:      2018-10-16 13:43 +0200
URL:       http://hg.openjdk.java.net/jdk/submit/rev/5a2af44ecb83

8212181: ZGC: Fix incorrect root iteration in ZHeapIterator
Reviewed-by: eosterlund

! src/hotspot/share/gc/z/zHeapIterator.cpp
! src/hotspot/share/gc/z/zHeapIterator.hpp