RFR: 8259859: Missing metaspace NMT memory tag

[Zhengyu Gu]

Please review this trivial fix that added missing NMT memory tag for metaspace.

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Commit messages:
 - update
 - init update

Changes: https://git.openjdk.java.net/jdk/pull/2107/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2107&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259859
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2107.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2107/head:pull/2107

PR: https://git.openjdk.java.net/jdk/pull/2107