[jdk21u] RFR: 8311591: Add SystemModulesPlugin test case that splits module descriptors with new local variables defined by DedupSetBuilder

[Mandy Chung]

On Wed, 16 Aug 2023 18:26:57 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [bc8e9f44](https://github.com/openjdk/jdk/commit/bc8e9f44a39ff59b59b2d1d5d546a148be75a2f2) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Christoph Schwentker on 15 Aug 2023 and was reviewed by Mandy Chung.
> 
> This is an additional test added for https://github.com/openjdk/jdk21u/pull/65.
> 
> Thanks!

@phohensee  you reviewed #65.  This is a new test going with the fix.  Do you mind reviewing this PR as well?

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PR Comment: https://git.openjdk.org/jdk21u/pull/66#issuecomment-1701477710