RFR: JDK-8260571: Add PrintMetaspaceStatistics to print metaspace statistics upon VM exit

[Ioi Lam]

On Thu, 28 Jan 2021 10:20:42 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> This patch adds a new diagnostic boolean switch `PrintMetaspaceStatistics`. When set, it will cause the VM to print a brief report about metaspace occupancy when exiting. It follows the same logic as `PrintNMTStatistics` and similar switches.

Marked as reviewed by iklam (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2283