RFR(XXS) 8220161: Shenandoah does not need to initialize PLABs for safepoint workers

[Aleksey Shipilev]

On 3/5/19 5:18 PM, zgu at redhat.com wrote:
> Please review this small patch that not creating PLAB for safepoint
> workers, it does not seem they evacuate anything.
> 
> It also fixes the crashes we have seen recently, because we never
> enable PLAB creation for late safepoint workers, that results trying to
> retire NULL PLAB during GC. 
> 
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8220161
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8220161/webrev.00/

Looks good.

-Aleksey

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