RFR: 8372258: Improve TypeVariable support [v3]

[Chen Liang]

On Tue, 25 Nov 2025 13:18:40 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> The `TypeVariableImpl::getGenericDeclaration` method should return copies of generic declarations where appropriate.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyright year

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28429#pullrequestreview-3505264398