Fix Reference.refersTo() intrinsic for heap poisoning.

Test: ART_HEAP_POISONING=true m test-art-host-gtest
Test: ART_HEAP_POISONING=true testrunner.py --host --optimizing
Test: run-gtests.sh # with ART_HEAP_POISONING=true
Test: testrunner.py --target --optimizing # with ART_HEAP_POISONING=true
Bug: 172573708
Change-Id: I2e09b49813bdad40c1e18bf5681ba2094c5a40c1
4 files changed