[jdk17] Integrated: JDK-8225667: Clarify the behavior of System::gc w.r.t. reference processing

[Mandy Chung]

On Wed, 30 Jun 2021 18:24:24 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> This spec clarification is a follow-up to [JDK-8224760](https://bugs.openjdk.java.net/browse/JDK-8224760?focusedCommentId=14268320&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14268320) w.r.t. reference processing.  Since there is no guarantee for any memory reclamation by the invocation of `System::gc`, the spec should also clarify that there is no guarantee in determining the change of reachability of any objects or any particular number of `Reference` objects be enqueued and cleared.
> 
> CSR:
>    https://bugs.openjdk.java.net/browse/JDK-8269690

This pull request has now been integrated.

Changeset: 3a690240
Author:    Mandy Chung <mchung at openjdk.org>
URL:       https://git.openjdk.java.net/jdk17/commit/3a690240336bda8582a15ca52f4dcb78be323dcd
Stats:     9 lines in 2 files changed: 9 ins; 0 del; 0 mod

8225667: Clarify the behavior of System::gc w.r.t. reference processing

Reviewed-by: rriggs, kbarrett, tschatzl

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PR: https://git.openjdk.java.net/jdk17/pull/183