RFR: 8367324: Avoid redundant parsing when formatting with DigitList [v2]

[Johannes Graham]

On Wed, 10 Sep 2025 21:06:53 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> Johannes Graham has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - use Level.Invocation
>>  - review fixes
>
> test/micro/org/openjdk/bench/java/text/DefFormatterBench.java line 100:
> 
>> 98:             // of the toString value if the BigDecimal instance was reused.
>> 99: 
>> 100:             BigDecimal bd = new BigDecimal(value.unscaledValue(), value.scale());
> 
> If we use `@Setup(Level.Iteration)` on setup, I believe we can ensure a fresh `bdValues` for each benchmark iteration measurement. Then we can remove the BD recreation to not be included within the benchmark results which should give us more accurate results.

Looks like `Level.Invocation` is the one I want.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27118#discussion_r2338174523