RFR: 8347566: Replace SSIZE_FORMAT with 'z' length modifier

[Coleen Phillimore]

Please review this change that replaces SSIZE_FORMAT with %zd.
Tested with tier1 on Oracle supported platforms (and here with GHA).

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Commit messages:
 - 8347566: Replace SSIZE_FORMAT with 'z' length modifier

Changes: https://git.openjdk.org/jdk/pull/23084/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23084&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347566
  Stats: 82 lines in 7 files changed: 2 ins; 3 del; 77 mod
  Patch: https://git.openjdk.org/jdk/pull/23084.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23084/head:pull/23084

PR: https://git.openjdk.org/jdk/pull/23084