hg: jdk/sandbox: 8212205: VM asserts after CDS archive has been unmapped

[chris.hegarty at oracle.com]

Changeset: e53af5fa0dae
Author:    iklam
Date:      2018-10-25 11:23 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/e53af5fa0dae

8212205: VM asserts after CDS archive has been unmapped
Reviewed-by: dholmes, jiangli, hseigel, stuefe

! src/hotspot/share/memory/allocation.hpp
! src/hotspot/share/memory/filemap.cpp
! src/hotspot/share/memory/metaspaceShared.cpp
! src/hotspot/share/memory/metaspaceShared.hpp