RFR: Clean up more uint -> size_t, int -> uint uses

[Roman Kennke]

Am 22.03.2017 um 09:06 schrieb Aleksey Shipilev:
> Hi,
>
> Another one for 9:
>   http://cr.openjdk.java.net/~shade/shenandoah/build/more-casts/webrev.01/
>
> Testing: hotspot_gc_shenandoah for 9.
>
> Thanks,
> -Aleksey
>
Ok