hg: jdk/sandbox: 8224497: Remove FIXME in metaspaceClosure.cpp

[chris.hegarty at oracle.com]

Changeset: 357c9dcb6eb9
Author:    ccheung
Date:      2019-06-07 14:03 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/357c9dcb6eb9

8224497: Remove FIXME in metaspaceClosure.cpp
Summary: Also cleaned up some comment and code related to the od (optional data) region.
Reviewed-by: iklam, jiangli

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