RFR: 8234502: Merge GenCollectedHeap and SerialHeap [v12]

[Lei Zaakjyu]

On Fri, 12 Jan 2024 09:07:16 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Tier1-6 pass.
> 
> I used `git diff --color-moved=dimmed_zebra <old> <new>` to check the change inside hotspot and it's mostly code-moving, as expected. There are some still format issues (header include order and broken indentation), which can probably be fixed in followup PRs.

I will have a try. Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16927#issuecomment-1888854135