RFR: JDK-8266536: Provide a variant of os::iso8601_time which works with arbitrary timestamps [v4]

[Thomas Stuefe]

On Wed, 5 May 2021 18:58:49 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   feedback yasumasa and xin
>
> The API change looks good to me. I understand that this is prerequisite of your logdecoration change. make sense.
> 
> I don't understand your change in harfbuzz header.

Thanks @navyxliu and @simonis and @YaSuenag for your reviews.

Last change:
- fixes the stray edit in the prototype Xin noted
- adds an explicit constant for the output buffer size of iso timestamps

@YaSuenag could you please officially approve this PR? Unfortunately, Xin is no committer yet, so I need a second reviewer.

Thanks, Thomas

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PR: https://git.openjdk.java.net/jdk/pull/3869