RFR: 8370807: G1: Improve region attribute table method naming

[Thomas Schatzl]

On Wed, 29 Oct 2025 11:49:36 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> There is assert(!hr->in_collection_set(), in the caller, which is conflicting with this semantic.

The reason is that that assert only checks the accelerator table, which must not indicate that we already added it. There is no long form of that in-collections-set check any more, we removed it quite some time ago because we thought it was superfluous.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28038#discussion_r2472857013