RFR (S): [8u] Sync up differences in Root{Processor,Evacuator} and Heap

[Aleksey Shipilev]

Hi,

Quite probably the last in the series of bringing 8u and 9 closer together:
  http://cr.openjdk.java.net/~shade/shenandoah/jdk9-8u/rp-heap-diffs/webrev.01/

Testing: hotspot-gc_shenandoah

Thanks,
-Aleksey