RFR: 8300913: ZGC: assert(to_addr != 0) failed: Should be forwarded

[Coleen Phillimore]

On Wed, 25 Jan 2023 15:56:49 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> We thought we didn't need the keep-alive call but we do for heap walking.
> Tested with failing test case locally, and tier1-4 in progress.

Thanks Erik and Robbin!

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PR: https://git.openjdk.org/jdk/pull/12202