RFR: 8359825: Parallel: Simplify MutableNUMASpace::ensure_parsability

[Sangheon Kim]

On Tue, 17 Jun 2025 13:24:04 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple `fill_with_object` -> `fill_with_objects` API  change to push the implementation logic to the callee.

LGTM

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Marked as reviewed by sangheki (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25852#pullrequestreview-2940752249