hg: jdk/sandbox: 8251336: OopHandle release can not be called in a safepoint

[chris.hegarty at oracle.com]

Changeset: 997ead23fa06
Author:    coleenp
Date:      2020-08-12 07:54 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/997ead23fa06

8251336: OopHandle release can not be called in a safepoint
Summary: Release OopStorage oops for threadObj for exiting threads outside the service lock region that is marked as safe for safepoint.
Reviewed-by: zgu, dholmes, kbarrett

! src/hotspot/share/runtime/serviceThread.cpp