RFR: 8319703: Serial: Remove generationSpec

[Thomas Schatzl]

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.

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16554#pullrequestreview-1750492324