Improve test coverage for oversized IPv4 octets, in particular, in IPv4-mapped IPv6 addresses.
--------- - [X] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Add tests for oversized IPv4 octets Changes: https://git.openjdk.org/jdk/pull/32784/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32784&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8391688 Stats: 18 lines in 2 files changed: 14 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jdk/pull/32784.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32784/head:pull/32784 PR: https://git.openjdk.org/jdk/pull/32784
