<i18n dev> RFR: 8345668: ZoneOffset.ofTotalSeconds performance regression [v2]

[Naoto Sato]

> 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.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Update src/java.base/share/classes/java/time/ZoneOffset.java
  
  Co-authored-by: Roger Riggs <Roger.Riggs at Oracle.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22854/files
  - new: https://git.openjdk.org/jdk/pull/22854/files/3df7e9f1..1e09b8be

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22854&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22854&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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