RFR: Coalesce dead objects in pinned old regions during full gc

[Kelvin Nilsen]

On Mon, 21 Feb 2022 23:46:51 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Pinned regions are not compacted during a full gc. For old regions, this may leave references in unmarked objects pointing into relocated or reclaimed memory. These unmarked objects need to be filled in to prevent the remembered set scan from following bad pointers.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/116