Re-add an xfail removed by r254163

The test is flakey but it fails too often with gcc 4.9.2 on x86_64 to
be marked only as expected flakey.

llvm-svn: 254194

lldb/packages/Python/lldbsuite/test/api/multithreaded/TestMultithreaded.py

@@ -37,6 +37,7 @@ class SBBreakpointCallbackCase(TestBase):
     @skipIfWindows # clang-cl does not support throw or catch (llvm.org/pr24538)
     @expectedFlakeyFreeBSD
     @expectedFlakeyLinux # Driver occasionally returns '1' as exit status
+    @expectedFailureAll("llvm.org/pr23139", oslist=["linux"], compiler="gcc", compiler_version=[">=","4.9"], archs=["x86_64"])
     def test_sb_api_listener_event_process_state(self):
         """ Test that a registered SBListener receives events when a process
             changes state.