hg: jdk/jdk: 8220465: Use shadow regions for faster ParallelGC full GCs

[stefan.johansson at oracle.com]

Changeset: c1ee5babd539
Author:    sjohanss
Date:      2019-10-23 21:28 +0800
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/c1ee5babd539

8220465: Use shadow regions for faster ParallelGC full GCs
Reviewed-by: sjohanss, tschatzl
Contributed-by: Haoyu Li <leihouyju at gmail.com>

! src/hotspot/share/gc/parallel/psCompactionManager.cpp
! src/hotspot/share/gc/parallel/psCompactionManager.hpp
! src/hotspot/share/gc/parallel/psParallelCompact.cpp
! src/hotspot/share/gc/parallel/psParallelCompact.hpp