RFR: Coalesce and fill dead objects after class unloading

[Kelvin Nilsen]

On Tue, 8 Feb 2022 16:48:05 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This reverts a recent change to coalesce and fill dead objects immediately after final mark. These objects cannot be filled until after class unloading to support a use case where the LRB needs to access from-space objects. So, rather than coalesce and fill during the concurrent mark phase, we move it to the evacuation phase of a degenerated cycle.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/111