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

Per Liden per.liden at oracle.com
Thu Sep 19 21:07:16 UTC 2019

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


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