RFR: Age objects before installing forwarding pointer to them

[Kelvin Nilsen]

On Fri, 4 Mar 2022 22:15:12 GMT, William Kemper <wkemper at openjdk.org> wrote:

> We cannot safely manipulate the mark word concurrently with mutators. This _should_ fix a crash issue reported on PPC 64.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/122