RFR(s): 8197993: Remove last use of JavaThread::flush_barrier_queues()

[Thomas Schatzl]

Hi,

On Thu, 2018-02-15 at 10:33 +0100, Per Liden wrote:
> With the introduction of BarrierSet::flush_deferred_barriers()
> there's 
> no reason to keep JavaThread::flush_barrier_queues() around anymore. 
> Replace the last call-site with a call to the barrier set instead.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8197993
> Webrev: http://cr.openjdk.java.net/~pliden/8197993/webrev.0/
> 
> /Per

  looks good.

Thomas