RFR: 8374549: Extend MetaspaceClosure to cover non-MetaspaceObj types

[Ashutosh Mehra]

On Mon, 5 Jan 2026 20:32:46 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> PackageEntry, ModuleEntry and GrowableArray cannot be subclasses from MetaspaceObject due to various constraints.

@iklam what prevents `PackageEntry` and `ModuleEntry` from being a subclass of `MetaspaceObject`?

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PR Comment: https://git.openjdk.org/jdk/pull/29049#issuecomment-3790849900