RFR: 8234502: Merge GenCollectedHeap and SerialHeap [v12]

[Lei Zaakjyu]

On Thu, 11 Jan 2024 21:25:31 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Sorry about the false alarms. Not noticing that vmStructs_serial.hpp was also updated threw me off. The changes look fine. I ran the SA tests locally and they passed.

It's alright. btw, thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16927#issuecomment-1888449188