[jdk21u-dev] RFR: 8351458: (ch) Move preClose to UnixDispatcher [v3]

[Shruthi Acharya]

> OpenJDK PR: https://github.com/openjdk/jdk/pull/23956
> OpenJDK bug: https://bugs.openjdk.org/browse/JDK-8351458
> 
> The original patch didn’t apply cleanly to the JDK21u-dev branch due to a copyright header mismatch. However, the rest of the changes were ported without issues. Manually updated the copyright header to resolve the conflict.

Shruthi Acharya has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  Backport 0de2cddf3a7be23f67af93972875af1235f3107e
  
  Signed-off-by: Shruthi <Shruthi.Shruthi1 at ibm.com>

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

Changes: https://git.openjdk.org/jdk21u-dev/pull/2051/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2051&range=02
  Stats: 163 lines in 12 files changed: 43 ins; 82 del; 38 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2051.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2051/head:pull/2051

PR: https://git.openjdk.org/jdk21u-dev/pull/2051