Add expectedFailure decorator for test_help_image_dump_symtab_should_not_crash().

Possibly due to http://llvm.org/viewvc/llvm-project?rev=120484&view=rev.

llvm-svn: 120503

lldb/test/help/TestHelp.py

@@ -24,6 +24,8 @@ class HelpCommandTestCase(TestBase):
         self.expect("help",
             startstr = 'The following is a list of built-in, permanent debugger commands')
 
+    @unittest2.expectedFailure
+    # rdar://problem/8713425
     def test_help_image_dump_symtab_should_not_crash(self):
         """Command 'help image dump symtab' should not crash lldb."""
         self.expect("help image dump symtab",