[jdk23] RFR: 8334421: assert(!oldbox->is_unbalanced()) failed: this should not be called for unbalanced region

[Aleksey Shipilev]

On Thu, 27 Jun 2024 15:55:27 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Clean backport of [JDK-8334421 fix](https://github.com/openjdk/jdk/commit/9c89f0861c1b6d25e1a7c3ac1add9a168d807788)

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19931#pullrequestreview-2145882899