RFR: 8366584: Add an InstanceKlass::super() method that returns InstanceKlass* [v3]

[Ioi Lam]

On Wed, 3 Sep 2025 11:38:49 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   @dholmes-ora and @coleep comments
>
> Looks good.  This will help with InstanceKlass casting.

Thanks @coleenp @dholmes-ora for the review

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PR Comment: https://git.openjdk.org/jdk/pull/27037#issuecomment-3251513937