Add test where aget on potential null array fails verification.

Bug: 64683522
Test: mm test-art-host-run-test
Change-Id: Idaaf87c3848873a39c75ce4b9cd0fc57620c4972
diff --git a/test/knownfailures.json b/test/knownfailures.json
index e20c2c8..20cfc34 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -714,5 +714,10 @@
                   "968-default-partial-compile-gen"],
         "env_vars": {"SANITIZE_HOST": "address"},
         "description": ["Test hits dex2oat watchdog timeout (60sec) on art-asan"]
+    },
+    {
+        "tests": "664-aget-verifier",
+        "description": ["Aget on potentially null array fails verification."],
+        "bug": "b/64683522"
     }
 ]