Add TestVMDebug to prebuilt libjdwp skips

This test relies on functionality that is not implemented in the
prebuilt libjdwp.

Test: ./art/tools/run-prebuilt-libjdwp-tests.sh --mode=host
Bug: 62821960
Change-Id: I83dc8ce3ebbdaafbc8563a7496f662800424e92a
diff --git a/tools/libjdwp_art_failures.txt b/tools/libjdwp_art_failures.txt
index fd711bb..66842c3 100644
--- a/tools/libjdwp_art_failures.txt
+++ b/tools/libjdwp_art_failures.txt
@@ -64,6 +64,11 @@
            "org.apache.harmony.jpda.tests.jdwp.EventModifiers.InstanceOnlyModifierTest#testMethodExit",
            "org.apache.harmony.jpda.tests.jdwp.EventModifiers.InstanceOnlyModifierTest#testMethodExitWithReturnValue" ]
 },
+{
+  description: "Tests for VMDebug functionality not implemented in the upstream libjdwp",
+  result: EXEC_FAILED,
+  name: "org.apache.harmony.jpda.tests.jdwp.VMDebug.VMDebugTest#testVMDebug"
+},
 /* TODO Categorize these failures more. */
 {
   description: "Tests that fail on both ART and RI. These tests are likely incorrect",