Add 689-zygote-jit-deopt as knownfailure while investigating.

Bug: 136584457
Change-Id: I0c571dbf318f34720cac64b33a298d87e417e7e1
diff --git a/test/knownfailures.json b/test/knownfailures.json
index ad0cbe8..71ecfd7 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1227,5 +1227,11 @@
                   "575-checker-string-init-alias"],
         "variant": "baseline",
         "description": [ "Working as intended tests that don't pass with baseline." ]
+    },
+    {
+        "tests": ["689-zygote-jit-deopt"],
+        "bug": "b/136584457",
+        "variant": "target & 64",
+        "description": [ "Fails on old kernels." ]
     }
 ]