RFR: 8330699: Remove -XX:+UseEmptySlotsInSupers.

[xiaotaonan]

Remove -XX:+UseEmptySlotsInSupers.

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Commit messages:
 - Remove -XX:+UseEmptySlotsInSupers.

Changes: https://git.openjdk.org/jdk/pull/19169/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19169&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330699
  Stats: 6 lines in 3 files changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19169.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19169/head:pull/19169

PR: https://git.openjdk.org/jdk/pull/19169