RFR: 8348089: Serial: Remove virtual specifier in SerialHeap

[Stefan Karlsson]

On Mon, 20 Jan 2025 10:16:04 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing unused `virtual` specifier and move `protected` methods to `private`.

Looks good, but should the `full` parameter be removed now that it isn't used?

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23196#pullrequestreview-2562284439