RFR: 8365814: Consolidate has_been_archived() and has_been_buffered() in ArchiveBuilder

[Vladimir Kozlov]

On Wed, 20 Aug 2025 04:01:13 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Merged the two methods into one: `ArchiveBuilder::has_been_archived()`. Added comments and asserts to explain what the expected result is.

Good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26853#pullrequestreview-3134774396