RFR: fastdebug updates matrix on evacuation

[Roman Kennke]

Am 10.05.2017 um 17:32 schrieb Aleksey Shipilev:
> Oops.
>
> http://cr.openjdk.java.net/~shade/shenandoah/assert-update-matix/webrev.01/
>
> Thanks,
> -Aleksey
>
Ok. Might need it someday when we're using the matrix for UR or such.
(Right now we're rebuilding the matrix during UR... reminds me that we
might want to skip building the matrix during conc-mark?)

Roman