[8u] RFR 8186770: NMT: Report metadata information in NMT summary

[Zhengyu Gu]

Please review this 8u backport.

There are minor conflicts after file path changes.

--- virtualMemoryTracker.cpp
+++ virtualMemoryTracker.cpp
@@ -1,5 +1,5 @@
  /*
- * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights 
reserved.
+ * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights 
reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
@@ -23,6 +23,7 @@
   */
  #include "precompiled.hpp"

+#include "memory/metaspace.hpp"
  #include "runtime/atomic.hpp"
  #include "runtime/os.hpp"
  #include "runtime/threadCritical.hpp"

Bug: https://bugs.openjdk.java.net/browse/JDK-8186770
Webrev: http://cr.openjdk.java.net/~zgu/8186770/webrev.8u.00/
JDK10 code review: 
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2017-September/024559.html

Thanks,

-Zhengyu