TestAttachResume is still flaky on linux. mark it as such

llvm-svn: 250069

lldb/test/functionalities/attach_resume/TestAttachResume.py

@@ -17,6 +17,7 @@ class AttachResumeTestCase(TestBase):
     @skipIfRemote
     @expectedFailureFreeBSD('llvm.org/pr19310')
     @expectedFailureWindows("llvm.org/pr24778")
+    @expectedFlakeyLinux('llvm.org/pr19310')
     def test_attach_continue_interrupt_detach(self):
         """Test attach/continue/interrupt/detach"""
         self.build()