[jdk25] RFR: 8360288: Shenandoah crash at size_given_klass in op_degenerated

[Aleksey Shipilev]

On Wed, 16 Jul 2025 18:04:12 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Clean backport. Fixes a crash in Shenandoah (ILW = P3). Only touches Shenandoah code.

Makes sense for JDK 25.

-------------

Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26356#pullrequestreview-3026234758