Disable failing test on table lookup.

Test: 641-checker-arraycopy
bug: 62611253
Change-Id: I816b8ae73317c547ca69a173209cb1802a066820
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 9f0f954..8bb3f9e 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -337,7 +337,8 @@
         "variant": "optimizing | regalloc_gc"
     },
     {
-        "tests": ["537-checker-arraycopy"],
+        "tests": ["537-checker-arraycopy",
+                  "641-checker-arraycopy"],
         "env_vars": {"ART_READ_BARRIER_TYPE": "TABLELOOKUP"}
     },
     {