RFR: 8317994: Serial: Use SerialHeap in generation

[Sangheon Kim]

On Thu, 12 Oct 2023 09:06:35 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple renaming and removing of redundant macro guards.

Marked as reviewed by sangheki (Reviewer).

Looks good.

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PR Review: https://git.openjdk.org/jdk/pull/16162#pullrequestreview-1674754360
PR Comment: https://git.openjdk.org/jdk/pull/16162#issuecomment-1760045462