RFR: Enable worker scaling for ref-proc

[Aleksey Shipilev]

On 07/19/2018 01:33 PM, Roman Kennke wrote:
> Recently I added the infra for worker-scaling for reference-processor,
> but overlooked that I need to enable it too:
> 
> diff --git a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
> b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
> --- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
> +++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
> @@ -2116,7 +2116,8 @@
>                             true,                    // MT discovery
>                             _max_workers,            // Degree of MT
> discovery
>                             false,                   // Reference
> discovery is not atomic
> -                           NULL);                   // No closure,
> should be installed before use
> +                           NULL,                    // No closure,
> should be installed before use
> +                           true);                   // Scale worker threads
> 
>    shenandoah_assert_rp_isalive_not_installed();
>  }

OK.

-Aleksey