RFR: Do not coalesce dead objects in global cycle if GC was cancelled

[Kelvin Nilsen]

On Thu, 14 Oct 2021 20:25:38 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Attempting to coalesce and fill with an incomplete mark context triggers an assert in debug builds (and may cause problems for a release build).

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/89