Blacklist 905-object-free on gcstress & jit & target

bug: 62562923
Test: test.py
Change-Id: I1dda4ae7d1241636979fcaaeb03f1215e72e81e2
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 9a8f3be..b7f5d4c 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -703,5 +703,11 @@
         "tests": ["059-finalizer-throw", "063-process-manager"],
         "description": [ "Tests that take too long on target with gcstress and debug" ],
         "variant": "gcstress & target & debug"
+    },
+    {
+        "tests": ["905-object-free"],
+        "description": [ "Flake on gcstress" ],
+        "bug": "b/62562923",
+        "variant": "gcstress & jit & target"
     }
 ]