RFR: Fix weakref precleaning

[Roman Kennke]

Am 31.05.2017 um 21:08 schrieb Aleksey Shipilev:
> On 05/31/2017 09:02 PM, Roman Kennke wrote:
>> Oops. Shouldn't do stuff in a rush.
>> http://cr.openjdk.java.net/~rkennke/fixpreclean/webrev.01/
> Remaining nits:
>
>  *) Since you removed the branch that made rp possibly NULL, you can use
> ReferenceProcessorIsAliveMutator again:
>
>  600     ReferenceProcessor* rp = sh->ref_processor();;
>  601
>  602     ReferenceProcessorMaybeNullIsAliveMutator fix_alive(rp,
> ShenandoahHeap::heap()->is_alive_closure());
>
>  *) Also notice ";;" above
>
> Other than that looks good.

Duh.

http://cr.openjdk.java.net/~rkennke/fixpreclean/webrev.02/
<http://cr.openjdk.java.net/%7Erkennke/fixpreclean/webrev.02/>

Roman