message: Un-XFAIL TestNamespaceLookup for linux
  These tests are now passing on linux, at least with top-of-tree clang,
  clang-6 and gcc-7.3. It's possible it may still be failing with some
  older compilers, but I don't have those around to test.
diff: @@ -42,10 +42,7 @@ class NamespaceLookupTestCase(TestBase):
  'stop reason = breakpoint'])
  @expectedFailureAll(
  - oslist=[
  - "windows",
  - "linux",
  - "freebsd"],
  + oslist=["windows", "freebsd"],
  bugnumber="llvm.org/pr25819")
  def test_scope_lookup_with_run_command(self):
  """Test scope lookup of functions in lldb."""
  @@ -230,10 +227,7 @@ class NamespaceLookupTestCase(TestBase):
  oslist=["linux"],
  debug_info=["dwo"]) # Skip to avoid crash
  @expectedFailureAll(
  - oslist=[
  - "windows",
  - "linux",
  - "freebsd"],
  + oslist=["windows", "freebsd"],
  bugnumber="llvm.org/pr25819")
  def test_scope_after_using_directive_lookup_with_run_command(self):
  """Test scope lookup after using directive in lldb."""
  @@ -297,10 +291,7 @@ class NamespaceLookupTestCase(TestBase):
  self.expect("expr -- func()", startstr="error")
  @expectedFailureAll(
  - oslist=[
  - "windows",
  - "linux",
  - "freebsd"],
  + oslist=["windows", "freebsd"],
  bugnumber="llvm.org/pr25819")
  def test_scope_lookup_shadowed_by_using_with_run_command(self):
  """Test scope lookup shadowed by using in lldb."""
  