Mark 098-ddmc as flaky on 6.0.1

Change-Id: I7e311c95b938edc746564a184c6db91bd7a78008
diff --git a/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java b/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
index 47c3e99..afba9d9 100644
--- a/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
+++ b/src/test/java/com/android/tools/r8/R8RunArtTestsTest.java
@@ -201,6 +201,8 @@
           // of '__gnu_cxx::recursive_init_error'
           .put("096-array-copy-concurrent-gc",
               TestCondition.match(TestCondition.runtimesUpTo(DexVm.Version.V4_4_4)))
+          // Failing with: expected "second > first =[tru]e" was "second > first =[fals]e"
+          .put("098-ddmc", TestCondition.match(TestCondition.runtimes(DexVm.Version.V6_0_1)))
           // Sometimes fails with out of memory on Dalvik.
           .put("114-ParallelGC",
               TestCondition.match(TestCondition.runtimesUpTo(DexVm.Version.V4_4_4)))