hg: jdk/jdk: 8237354: Add option to jcmd to write a gzipped heap dump

[ralf.schmelter at sap.com]

Changeset: 649ca60ef516
Author:    rschmelter
Date:      2020-06-10 12:29 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/649ca60ef516

8237354: Add option to jcmd to write a gzipped heap dump
Reviewed-by: rrich, clanger, goetz

! src/hotspot/share/gc/shared/workgroup.cpp
! src/hotspot/share/gc/shared/workgroup.hpp
! src/hotspot/share/services/diagnosticCommand.cpp
! src/hotspot/share/services/diagnosticCommand.hpp
! src/hotspot/share/services/heapDumper.cpp
! src/hotspot/share/services/heapDumper.hpp
+ src/hotspot/share/services/heapDumperCompression.cpp
+ src/hotspot/share/services/heapDumperCompression.hpp
! src/java.base/share/native/libzip/zip_util.c
+ test/hotspot/jtreg/serviceability/dcmd/gc/HeapDumpCompressedTest.java
+ test/lib/jdk/test/lib/hprof/parser/GzipRandomAccess.java
! test/lib/jdk/test/lib/hprof/parser/HprofReader.java
! test/lib/jdk/test/lib/hprof/parser/Reader.java