hg: jdk8u/jdk8u-dev/hotspot: 8255717: Fix JFR crash in WriteObjectSampleStacktrace due to object not initialized

[paul.hohensee at gmail.com]

Changeset: 5f51c6044a7c
Author:    hshi
Date:      2020-11-12 20:01 +0800
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/5f51c6044a7c

8255717: Fix JFR crash in WriteObjectSampleStacktrace due to object not initialized
Reviewed-by: phh

! src/share/vm/gc_interface/collectedHeap.cpp
! src/share/vm/gc_interface/collectedHeap.inline.hpp
! src/share/vm/memory/threadLocalAllocBuffer.hpp