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

[Thomas Schatzl]

On Fri, 2 Oct 2020 11:01:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Marked as reviewed by shade (Reviewer).
>
> ...and yes, it is trivial.

Thanks @albertnetymk, @shipilev for your reviews.

-------------

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