Enabled TestBreakAfterJoin.py on Linux.

This is related to:
http://llvm.org/bugs/show_bug.cgi?id=16170

This test ran successfully 40 out of 40 times on Ubuntu 12.04 LTS
x86_64.

llvm-svn: 202508

lldb/test/functionalities/thread/break_after_join/TestBreakAfterJoin.py

@@ -22,7 +22,6 @@ class BreakpointAfterJoinTestCase(TestBase):
 
     @expectedFailureDarwin("llvm.org/pr15824") # thread states not properly maintained
     @expectedFailureFreeBSD("llvm.org/pr18190") # thread states not properly maintained
-    @skipIfLinux # llvm.org/pr16170 -- this test causes LLDB to hang in waitpid() and the inferior is left in the Sleeping (S) state
     @dwarf_test
     def test_with_dwarf(self):
         """Test breakpoint handling after a thread join."""