Skip TestDataFormatterStdMap on linux instead of xfailing.

[sivachandra]

Summary

After 7181dae1248cc1b03505cca1b7c6e3dfeffefc0a, this test progresses
much further but crashes. Will skip this test while I fix this properly.

lldb/trunk/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/map/TestDataFormatterStdMap.py

def test_with_dsym_and_run_command(self):
         self.buildDsym()
         self.data_formatter_commands()
 
     @skipIfGcc # llvm.org/pr15036: When built with GCC, this test causes lldb to crash with
                # assert DeclCXX.h:554 queried property of class with no definition
     @expectedFailureIcc   # llvm.org/pr15301: LLDB prints incorrect size of
                           # libstdc++ containers
     @skipIfFreeBSD
-    @expectedFailureLinux # non-core functionality, need to reenable and fix
-                          # later (DES 2014.11.07). Most likely failing because
-                          # of mis-match is version of libstdc++ supported by
-                          # the data-formatters.
+    @skipIfLinux # non-core functionality, need to reenable and fix
     @dwarf_test
     def test_with_dwarf_and_run_command(self):
         """Test data formatter commands."""
         self.buildDwarf()
         self.data_formatter_commands()
 
     def setUp(self):
         # Call super's setUp().