RFR: 8301552: Use AtomicReferenceArray for caching instead of CHM in ZoneOffset [v4]

[Stephen Colebourne]

On Wed, 1 Feb 2023 20:19:20 GMT, cheenar <duke at openjdk.org> wrote:

>> test/jdk/java/time/tck/java/time/zone/TCKFixedZoneRules.java line 141:
>> 
>>> 139:     @Test(dataProvider="rules")
>>> 140:     public void test_isValidOffset_LDT_ZO(ZoneRules test, ZoneOffset expectedOffset) {
>>> 141:         if (expectedOffset == ZoneOffset.UTC)
>> 
>> Extremely minor but why not wrap if with `{}` for improved readability here with the comment
>
> Same [here](https://github.com/openjdk/jdk/pull/12346/commits/ec49ca3bc03d2e97fa0429c84290923066667871?diff=unified&w=0#diff-9e5aa282dc2d02c31e1d7c5ec8196a1d3d23c06e471d5114d0bd0c78ee4fe5f6R433) although it feels much more dangerous than the test!

Yes, please always wrap with `{}` in java.time.*

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PR: https://git.openjdk.org/jdk/pull/12346