Integrated: 8257077: ZGC: Remove ZWorkers::run_serial()

[Per Liden]

On Wed, 25 Nov 2020 13:02:55 GMT, Per Liden <pliden at openjdk.org> wrote:

> `ZWorkers::run_serial()` is no longer used and can be removed.

This pull request has now been integrated.

Changeset: 434b98fe
Author:    Per Liden <pliden at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/434b98fe
Stats:     5 lines in 2 files changed: 0 ins; 5 del; 0 mod

8257077: ZGC: Remove ZWorkers::run_serial()

Reviewed-by: stefank

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PR: https://git.openjdk.java.net/jdk/pull/1432