RFR (XS): NPG: MetaspaceMemoryPool should report statistics for all of metaspace

[Erik Helin]

Hi all,

this small fix ensures that the metaspace memory pool reports data for
all kinds of metadata, both class metadata and non-class metadata. This
way it behaves similar to the performance counters.

Please note that the compressed class space memory pool will still report only
class metadata if compressed class pointers are used.

Webrev:
http://cr.openjdk.java.net/~ehelin/8023219/webrev.00/

Thanks,
Erik