Honor the read barrier option in IRT::Get().

Bug: 12687968
Change-Id: Ia69570d57542891a873213e00242953825a1458d
diff --git a/runtime/indirect_reference_table-inl.h b/runtime/indirect_reference_table-inl.h
index c826716..00f7b06 100644
--- a/runtime/indirect_reference_table-inl.h
+++ b/runtime/indirect_reference_table-inl.h
@@ -79,7 +79,7 @@
   mirror::Object* obj = table_[idx].Read<kWithoutReadBarrier>();
   if (LIKELY(obj != kClearedJniWeakGlobal)) {
     // The read barrier or VerifyObject won't handle kClearedJniWeakGlobal.
-    obj = table_[idx].Read();
+    obj = table_[idx].Read<kReadBarrierOption>();
     VerifyObject(obj);
   }
   return obj;