Integrated: Fix verifier handling of weak references when scanning the remembered set

[William Kemper]

On Wed, 19 May 2021 22:02:11 GMT, William Kemper <wkemper at openjdk.org> wrote:

> In some use cases, `ShenandoahVerifier` is required to _ignore_ weak references (because they will be processed concurrently). Because of the way the remembered set scan handles oops, it must use an `OopIterateClosure` (not a bare `OopClosure`). To make use of the `OopClosure` passed to the remembered set scanner, it was wrapped in an "adapter" that sheared off the `ShenandoahIgnoreReferenceDiscoverer` configured on the passed in closure. This change removes the need to use such an adapter during the verifier's root scan.

This pull request has now been integrated.

Changeset: fff87a60
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.java.net/shenandoah/commit/fff87a60f33d60690a9335982738d968f3b9e1ab
Stats:     13 lines in 4 files changed: 5 ins; 0 del; 8 mod

Fix verifier handling of weak references when scanning the remembered set

Reviewed-by: zgu, rkennke

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PR: https://git.openjdk.java.net/shenandoah/pull/41