RFR: Tacking termination of weakref processing

[Aleksey Shipilev]

On 07/13/2018 05:28 PM, Zhengyu Gu wrote:
> Weak reference processing also enters terminator, which was missed in earlier patch.
> 
> Also, fixed typo in early patch.
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/weakref_term/webrev.00/

Back-slash is misaligned:

 437   diagnostic(bool, ShenandoahTerminationTrace, false,                        \

Otherwise looks good to me.

-Aleksey