The change made in [JDK-8288723](https://bugs.openjdk.org/browse/JDK-8288723) seems innocuous, but it caused this performance regression. Partially reverting the change (ones that involve `computeIfAbsent()`) to the original. Provided a benchmark that iterates the call to `ZoneOffset.ofTotalSeconds(0)` 1,000 times, which improves the operation time from 3,946ns to 2,241ns.
------------- Commit messages: - initial commit Changes: https://git.openjdk.org/jdk/pull/22854/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22854&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8345668 Stats: 78 lines in 4 files changed: 69 ins; 0 del; 9 mod Patch: https://git.openjdk.org/jdk/pull/22854.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22854/head:pull/22854 PR: https://git.openjdk.org/jdk/pull/22854
