Revert "Revert "ART: Reference.getReferent intrinsic for x86 and x86_64""

This reverts commit 0997d24e67d78f2146ebae2888eda0d7d254789a.

ART_HEAP_POISONING=true mode is fixed.

Change-Id: I83f6d5c101ea6a86802753f81b3e4348a263fb21
Signed-off-by: Serguei Katkov <serguei.i.katkov@intel.com>
8 files changed