RFR: 8319703: Serial: Remove generationSpec

[Albert Mingkun Yang]

On Wed, 8 Nov 2023 10:51:19 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple cleanup of removing an unnecessary indirection. The real change is only 11 LOC, using the global variables directly for young/old gen.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16554#issuecomment-1828140398