[TestFormatters, TestDataFormatterSynthVal] Mark as xfail.

[sivachandra]

Summary

This is to get the bots to go green while a robust solution to fix these
tests is worked out.

[tberghammer]

Please update the bug with information about linux

[sivachandra]

Committed after updating the bug.

test/expression_command/formatters/TestFormatters.py

class ExprFormattersTestCase(TestBase):
     @skipUnlessDarwin
     @dsym_test
     def test_with_dsym(self):
         """Test expr + formatters for good interoperability."""
         self.buildDsym()
         self.do_my_test()
 
     @expectedFailureFreeBSD('llvm.org/pr19011') # Newer Clang omits C1 complete object constructor
+    @expectedFailureLinux('llvm.org/pr19011', ['clang'])
     @dwarf_test
     def test_with_dwarf(self):
         """Test expr + formatters for good interoperability."""
         self.buildDwarf()
         self.do_my_test()
 
     def do_my_test(self):
         

test/functionalities/data-formatter/data-formatter-synthval/TestDataFormatterSynthVal.py

class DataFormatterSynthValueTestCase(TestBase):
     @dsym_test
     def test_with_dsym_and_run_command(self):
         """Test using Python synthetic children provider to provide a value."""
         self.buildDsym()
         self.data_formatter_commands()
 
     @skipIfFreeBSD # llvm.org/pr20545 bogus output confuses buildbot parser
     @dwarf_test
+    @expectedFailureLinux('llvm.org/pr19011', ['clang'])
     def test_with_dwarf_and_run_command(self):
         """Test using Python synthetic children provider to provide a value."""
         self.buildDwarf()
         self.data_formatter_commands()
 
     def setUp(self):
         # Call super's setUp().
         TestBase.setUp(self)