RFR: 8306711: Improve diagnosis of `IntlTest` framework [v3]

[Justin Lu]

On Wed, 26 Apr 2023 20:08:51 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> Justin Lu has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Move getErrorCount() back to original spot
>>  - Regardles of nothrow, final result should be logged, cache, move method back
>
> Looks good overall perhaps consider using `HexFormat` instead of the private method `toHexString`

@LanceAndersen Thanks for the review. Changed it so that `HexFormat` methods are used, luckily only one subclass used `toHexString`.

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PR Comment: https://git.openjdk.org/jdk/pull/13655#issuecomment-1524179840