hg: jdk/jdk: 8240679: ZGC GarbageCollectorMXBean reports inaccurate post GC heap size for ZHeap pool

[per.liden at oracle.com]

Changeset: 565a7778d47f
Author:    pliden
Date:      2020-04-30 10:59 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/565a7778d47f

8240679: ZGC GarbageCollectorMXBean reports inaccurate post GC heap size for ZHeap pool
Reviewed-by: eosterlund

! src/hotspot/share/gc/z/zDriver.cpp
! src/hotspot/share/gc/z/zServiceability.cpp
! src/hotspot/share/gc/z/zServiceability.hpp
+ test/hotspot/jtreg/gc/z/TestGarbageCollectorMXBean.java
+ test/hotspot/jtreg/gc/z/TestMemoryMXBean.java
+ test/hotspot/jtreg/gc/z/TestMemoryManagerMXBean.java
! test/jdk/java/lang/management/MemoryMXBean/MemoryTest.java
- test/jdk/java/lang/management/MemoryMXBean/MemoryTestZGC.sh