RFR: 8330607: Deprecate -XX:+UseEmptySlotsInSupers

[Coleen Phillimore]

Please review this patch to deprecate this command line option, once the CSR is approved.
Tested with runtime/CommandLine tests.

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Commit messages:
 - 8330607: Deprecate -XX:+UseEmptySlotsInSupers

Changes: https://git.openjdk.org/jdk/pull/18868/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18868&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330607
  Stats: 4 lines in 3 files changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18868.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18868/head:pull/18868

PR: https://git.openjdk.org/jdk/pull/18868