RFR: 8354347: Increase the default padding size for aarch64 in JDK code.

[Peter B. Kessler]

Increase the default padding for C++ fields to avoid false sharing.

-------------

Commit messages:
 - JDK-8354347: Update copyright date.
 - JDK-8354347: Increase the default padding size for aarch64 in JDK code.

Changes: https://git.openjdk.org/jdk/pull/24994/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24994&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354347
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24994.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24994/head:pull/24994

PR: https://git.openjdk.org/jdk/pull/24994