RFR: 8371825: G1: Use more precise filler API in fill_range_with_dead_objects

[Albert Mingkun Yang]

On Thu, 13 Nov 2025 17:14:03 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Replace `fill_with_objects` with `fill_with_object` for dead-space inside a heap-region.
> 
> Test: tier1-5

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/28302#issuecomment-3541582953