Adding some more flakey tests to the XFAIL list

llvm-svn: 240327
diff --git a/lldb/test/dosep.py b/lldb/test/dosep.py
index ce0a68f..27716c9 100755
--- a/lldb/test/dosep.py
+++ b/lldb/test/dosep.py
@@ -251,6 +251,7 @@
             "TestExitDuringStep.py",
             "TestHelloWorld.py", # Times out in ~10% of the times on the build bot
             "TestMultithreaded.py",
+            "TestRegisters.py", # ~12/600 dosep runs (build 3120-3122)
             "TestThreadStepOut.py",
         }
     elif target.startswith("android"):