hg: jdk/jdk: 8139652: Mutator refinement processing should take the oldest dirty card buffer

[kim.barrett at oracle.com]

Changeset: 44a909932c7c
Author:    kbarrett
Date:      2020-03-19 18:11 -0400
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/44a909932c7c

8139652: Mutator refinement processing should take the oldest dirty card buffer
Summary: Changed mutator refinement to take from queue rather than in-place and reuse.
Reviewed-by: tschatzl, sjohanss

! src/hotspot/share/gc/g1/g1DirtyCardQueue.cpp
! src/hotspot/share/gc/g1/g1DirtyCardQueue.hpp