RFR: 8231266: ZGC: Minor cleanups in ZCollectedHeap and ZHeap

[erik.osterlund at oracle.com]

Hi Per,

Looks good.

Thanks,
/Erik

On 09/19/2019 11:07 PM, Per Liden wrote:
> ZCollectedHeap's is_oop() and print_location() should delegate to 
> ZHeap. Also adjusting a few types, so that the ZHeap interface uses 
> uintptr_t. This keeps things consistent and avoids a few casts in ZHeap.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8231266
> Webrev: http://cr.openjdk.java.net/~pliden/8231266/webrev.0
>
> /Per