RFR (S) JDK-8085983 G1CollectedHeap::collection_set_iterate_from() has unused code and can be simplified

[Joseph Provino]

These changes clean up the HeapRegionClosure code.

There are a lot of changes but they're all very similar.

http://cr.openjdk.java.net/~jprovino/8085983/webrev.04/

JDK-8085983 G1CollectedHeap::collection_set_iterate_from() has unused 
code and can be simplified 
<https://bugs.openjdk.java.net/browse/JDK-8085983>

Thanks.

joe
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