Disable test while investigating.

Change-Id: Iea1a5b59582d2d12aba8ca5eb5eab3db3cc9dd59
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index 65c3fed..992a8a6 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -144,5 +144,11 @@
   modes: [device],
   names: ["libcore.io.OsTest#test_xattr"],
   bug: 22258911
+},
+{
+  description: "fails on L builds: needs investigation",
+  result: EXEC_FAILED,
+  modes: [device],
+  names: ["org.apache.harmony.tests.java.lang.ClassTest#test_forNameLjava_lang_String"]
 }
 ]