RFR: 8273386: Remove duplicated code in G1DCQS::abandon_completed_buffers

[Thomas Schatzl]

On Mon, 6 Sep 2021 14:54:28 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this small change to remove some redundant code in
> G1DirtyCardQueueSet::abandon_completed_buffers.  After the two removed lines
> it calls take_all_completed_buffers, which begins with those same two lines.
> 
> Testing:
> Local (linux-x64) hotspot:tier1 with -XX:+UseG1GC.

Lgtm and trivial.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5382