RFR: 8368968: FloatingDecimal: Clean up unused code [v2]

[Raffaello Giulietti]

On Tue, 30 Sep 2025 18:42:59 GMT, Johannes Graham <duke at openjdk.org> wrote:

>> This is a followup to https://github.com/openjdk/jdk/pull/27118, to clean up resulting unused code.
>> - remove `getChars`, `isExceptional` and `isNegative` 
>> - remove `ExceptionalBinaryToASCIIBuffer`; throws `IllegalArgumentException` instead of returning an instance of that.(Caller already asserts non-exceptional arg)
>
> Johannes Graham has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/java.base/share/classes/jdk/internal/math/FloatingDecimal.java
>   
>   Co-authored-by: Raffaello Giulietti <raffaello.giulietti at oracle.com>

Looks fine.
Thanks @j3graham for the quick turnaround.

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Marked as reviewed by rgiulietti (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27581#pullrequestreview-3286387809