Add test 2000 to redefine-stress skips

The test uses invoke-polymorphic instruction which slicer doesn't know
how to decode.

Test: ./test.py --host --redefine-stress -t 2000
Bug: 37272822
Bug: 146206656
Change-Id: Id78f6baa03f90480fcdf554408d63e48aa5fd326
diff --git a/test/knownfailures.json b/test/knownfailures.json
index c5115e9..2e2d7f7 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -447,7 +447,8 @@
             "1976-hello-structural-static-methods",
             "1985-structural-redefine-stack-scope",
             "1986-structural-redefine-multi-thread-stack-scope",
-            "1987-structural-redefine-recursive-stack-scope"
+            "1987-structural-redefine-recursive-stack-scope",
+            "2000-virtual-list-structural"
         ],
         "description": [
             "Tests for/using bytecodes introduced after DEX version 037 that are unsupported by",