Integrated: 8264374: Shenandoah: Remove leftover parallel reference processing argument

[Zhengyu Gu]

On Mon, 29 Mar 2021 17:27:36 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Shenandoah no longer uses parallel reference processor,  no reason to enable it.
> 
> Test:
> - [x] hotspot_gc_shenandoah

This pull request has now been integrated.

Changeset: ac604a18
Author:    Zhengyu Gu <zgu at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/ac604a18
Stats:     4 lines in 1 file changed: 0 ins; 4 del; 0 mod

8264374: Shenandoah: Remove leftover parallel reference processing argument

Reviewed-by: shade

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PR: https://git.openjdk.java.net/jdk/pull/3246