hg: jdk-updates/jdk11u-dev: 8213231: ThreadSnapshot::_threadObj can become stale

[jianglizhou at google.com]

Changeset: dd23c089a570
Author:    ehelin
Date:      2019-01-23 13:40 +0100
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/dd23c089a570

8213231: ThreadSnapshot::_threadObj can become stale
Reviewed-by: dcubed, dholmes, rehn

! src/hotspot/share/runtime/vmOperations.cpp
! src/hotspot/share/runtime/vmOperations.hpp
! src/hotspot/share/services/management.cpp
! src/hotspot/share/services/threadService.cpp
! src/hotspot/share/services/threadService.hpp