RFR: 8253928: G1: Remove G1ConcurrentMarkThread::set_in_progress declaration

[Aleksey Shipilev]

On Fri, 2 Oct 2020 10:45:21 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> There is no definition of G1ConcurrentMarkThread::set_in_progress since JDK-8240556 any more, so also remove the
> declaration in this trivial change.
> Testing: local compilation

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/480