[jdk16] RFR: 8259757: add a regression test for 8259353 and 8259601 [v2]

[Igor Ignatyev]

On Sat, 16 Jan 2021 02:17:50 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> Igor Ignatyev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix copyright year
>
> Marked as reviewed by jiefu (Committer).

Thanks guys.

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PR: https://git.openjdk.java.net/jdk16/pull/120