hg: jdk/jdk: 8200613: SA: jstack throws UnmappedAddressException with a CDS core file

[jini.george at oracle.com]

Changeset: a6182c464b31
Author:    jgeorge
Date:      2018-12-12 10:13 +0530
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/a6182c464b31

8200613: SA: jstack throws UnmappedAddressException with a CDS core file
Summary: Dump the closed archive heap space into the corefile on Linux by setting bit 2 of the coredump_filter file to dump the file backed private mappings.
Reviewed-by: iklam, cjplummer, kevinw, coleenp

! src/hotspot/os/linux/globals_linux.hpp
! src/hotspot/os/linux/os_linux.cpp
! src/hotspot/share/classfile/classLoader.cpp
! src/hotspot/share/classfile/classLoader.hpp
! test/hotspot/jtreg/serviceability/sa/ClhsdbCDSCore.java