RFR: 8317675: Serial: Move gc/shared/generation to serial folder

[Albert Mingkun Yang]

On Fri, 6 Oct 2023 12:30:14 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple moving files/renamings.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16072#issuecomment-1757818459