Disable LinuxCoreTestCase.test_s390x

This seems to hang on non-s390x hosts.  Disable for now to get the build
bots going again.

llvm-svn: 266343

lldb/packages/Python/lldbsuite/test/functionalities/postmortem/linux-core/TestLinuxCore.py

@@ -30,6 +30,8 @@ class LinuxCoreTestCase(TestBase):
         """Test that lldb can read the process information from an x86_64 linux core file."""
         self.do_test("x86_64", self._x86_64_pid)
 
+    # This seems to hang on non-s390x platforms for some reason.  Disabling for now.
+    @skipIf(archs=no_match(['s390x'])) 
     def test_s390x(self):
         """Test that lldb can read the process information from an s390x linux core file."""
         self.do_test("s390x", self._s390x_pid)