hg: jdk/sandbox: 8234691: Potential double-free in ParallelSPCleanupTask constructor

[chris.hegarty at oracle.com]

Changeset: 3773a32c1ef8
Author:    dbuck
Date:      2020-04-21 19:52 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/3773a32c1ef8

8234691: Potential double-free in ParallelSPCleanupTask constructor
Summary: Prevent extraneous constructor call
Reviewed-by: dholmes, stefank

! src/hotspot/share/gc/shared/workgroup.hpp
! src/hotspot/share/runtime/safepoint.cpp