Remove expectedFailureFreeBSD from passing ThreadExitTestCase::test_with_dwarf

This passes on my FreeBSD stable/10 desktop and my new FreeBSD
11-current buildbot (which is not yet hooked up to the buildmaster).

llvm.org/pr18190

llvm-svn: 254000

lldb/packages/Python/lldbsuite/test/functionalities/thread/thread_exit/TestThreadExit.py

@@ -24,7 +24,6 @@ class ThreadExitTestCase(TestBase):
         self.break_3 = line_number('main.cpp', '// Set third breakpoint here')
         self.break_4 = line_number('main.cpp', '// Set fourth breakpoint here')
 
-    @expectedFailureFreeBSD("llvm.org/pr18190") # thread states not properly maintained
     @expectedFailureWindows("llvm.org/pr24681")
     def test(self):
         """Test thread exit handling."""