RFR: 8344479: Declare MetaspaceObj::operator delete to be deleted

[Coleen Phillimore]

Please review this trivial change to delete the MetaspaceObj::operator delete method.

Sanity tested with tier1 on supported platforms.

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Commit messages:
 - 8344479: Declare MetaspaceObj::operator delete to be deleted

Changes: https://git.openjdk.org/jdk/pull/22259/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22259&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344479
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22259.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22259/head:pull/22259

PR: https://git.openjdk.org/jdk/pull/22259