RFR(xxs): 8227032: MetaspaceUtils::print_report crashes when called before initialization

[Thomas Stüfe]

Hi all,

this is a tiny fix which prevents MetaspaceUtils::print_report from
crashing when called before metaspace is initialized.

Issue: https://bugs.openjdk.java.net/browse/JDK-8227032
webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/8227032-metaspaceutils-print-report-pre-init-crash/webrev.00/webrev/index.html

Thanks, Thomas