RFR(S) Queuing string dedup candidates when they are evacuating at safepoints

[Aleksey Shipilev]

On 09/12/2017 02:56 AM, Zhengyu Gu wrote:
> String dedup protocol requires deduplication outside of safepoints. When strings are evacuated
> during safepoints, we need to queue the candidates and process them by string dedup thread later.
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/safepoint_strdedup/webrev.00/

Looks good.

-Aleksey