RFR: 8265418: Clean-up redundant null-checks of Class.getPackageName() [v3]

[Сергей Цыпанов]

On Fri, 28 May 2021 06:41:51 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Сергей Цыпанов has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8265418: Compare package names with == instead of equals()
>
> I see this has been integrated but I have concerns that the use-sites now all assume that the package name has been intern'ed. We may some crumbs, maybe in an implNote or comment in the Class::getPackageName code, otherwise we risk breakage if getPackageName changed to return a non-intern'ed string at some point.

@AlanBateman should I then add an implNote to explicitly specify that returned value must be interned?

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PR: https://git.openjdk.java.net/jdk/pull/3571