git: openjdk/jdk: 8261473: Shenandoah: Add breakpoint support

[Zhengyu Gu]

Changeset: 9cf4f90d
Author:    Zhengyu Gu <zgu at openjdk.org>
Date:      2021-02-18 18:32:01 +0000
URL:       https://git.openjdk.java.net/jdk/commit/9cf4f90d

8261473: Shenandoah: Add breakpoint support

Reviewed-by: rkennke, shade

+ src/hotspot/share/gc/shenandoah/shenandoahBreakpoint.cpp
+ src/hotspot/share/gc/shenandoah/shenandoahBreakpoint.hpp
! src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp
! test/hotspot/jtreg/gc/TestConcurrentGCBreakpoints.java
! test/hotspot/jtreg/gc/TestReferenceClearDuringReferenceProcessing.java