RFR: 8257073: ZGC: Try forward object before retaining page

[Stefan Karlsson]

On Wed, 25 Nov 2020 12:44:01 GMT, Per Liden <pliden at openjdk.org> wrote:

> This is a follow up to @albertnetymk's comment in the review of #1228, where he suggested that we could try to forward the object before we go ahead and retain the page. This could be an optimization in two cases:
> 1) A mutator would avoid a relocation stall in case the page is claimed, but the object the mutator is interested in has already been relocated.
> 2) The worker thread detaching the page would not have to wait for a mutator that is just forwarding an object.

Marked as reviewed by stefank (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/1431