RFR(T) 8222403: Shenandoah: Remove ShenandoahAlwaysTrueClosure, use AlwaysTrueClosure instead

[Aleksey Shipilev]

On 4/12/19 3:43 PM, Zhengyu Gu wrote:
> Please review this trivial cleanup, to remove deplicated closure.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8222403
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8222403/webrev.00/
> 
> Test:
>   hotspot_gc_shenandoah: Linux 64 (fastdebug and release)

Looks good!

-Aleksey