Implement Reference.refersTo() intrinsic.

Test: Added tests to 122-npe and 160-read-barrier-stress
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: run-gtests.sh
Test: testrunner.py --target --optimizing
Bug: 172573708
Change-Id: I8342510565289058df218d3249ffac1eb993ca4f
diff --git a/compiler/optimizing/intrinsics.h b/compiler/optimizing/intrinsics.h
index 48a1035..62b5faa 100644
--- a/compiler/optimizing/intrinsics.h
+++ b/compiler/optimizing/intrinsics.h
@@ -139,6 +139,7 @@
   static MemberOffset GetReferenceDisableIntrinsicOffset();
   static MemberOffset GetReferenceSlowPathEnabledOffset();
   static void CreateReferenceGetReferentLocations(HInvoke* invoke, CodeGenerator* codegen);
+  static void CreateReferenceRefersToLocations(HInvoke* invoke);
 
  protected:
   IntrinsicVisitor() {}