Blacklist failing tests, and rename one.

To go back to green after configuration changes.

bug: 36344364
bug: 36344221
bug: 36335999
Change-Id: Ibf1a7606d895aad9567d7f5109f6f3761b1e4efe
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 535b94f..5923ebd 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -341,5 +341,17 @@
                   "641-checker-arraycopy"],
         "env_vars": {"ART_USE_READ_BARRIER": "true"},
         "variant": "interpreter | optimizing | regalloc_gc | jit"
+    },
+    {
+        "tests": "946-obsolete-throw",
+        "bug": "http://b/36335999",
+        "variant": "interp-ac & gcstress"
+    },
+    {
+        "tests": ["912-classes",
+                  "616-cha",
+                  "616-cha-abstract"],
+        "bug": "http://b/36344364 http://b36344221",
+        "variant": "no-dex2oat | relocate-npatchoat"
     }
 ]