Disable test 154 for JIT

The compiler may cause too many GCs to occur.

Bug: 35917229

Test: test-art-host ART_TEST_JIT
Test: test/testrunner/testrunner.py  --host --jit

Change-Id: I1c1fbd01e815b1f9117b45ab9a419c5824c17dad
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 6caf7b0..8681815 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -129,11 +129,15 @@
                         "lot."]
     },
     {
-        "tests": ["964-default-iface-init-gen",
-                 "154-gc-loop"],
+        "test": "964-default-iface-init-gen",
         "variant": "gcstress"
     },
     {
+        "tests": "154-gc-loop",
+        "variant": "gcstress | jit",
+        "description": ["154-gc-loop depends GC not happening too often"]
+    },
+    {
         "test": "115-native-bridge",
         "variant": "target",
         "description": ["115-native-bridge setup is complicated. Need to",