RFR: 8325635: Serial: Use concrete type for verify_used_region_at_save_marks

[Stefan Karlsson]

On Mon, 12 Feb 2024 12:57:11 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial signature update.

Looks good.

Though it is not clear to me that it is worth having a separate function for this instead of just inlining this code into scan_old_to_young_ref. I was wondering what the name `verify_used_region_at_save_marks` meant and why it was taking a TenuredSpace. It made more sense when I read the code in conjuncture with the caller.

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17807#pullrequestreview-1875216183