[lldb] Skip two lldb tests on Windows because they are flaky

[stella.stamenova]

Summary

These tests work fine with VS2017, but become more flaky with VS2019 and the buildbot is about to get upgraded.

lldb/test/API/functionalities/thread/thread_specific_break_plus_condition/TestThreadSpecificBpPlusCondition.py

class ThreadSpecificBreakPlusConditionTestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
     # test frequently times out or hangs
     @skipIfDarwin
     # hits break in another thread in testrun
     @add_test_categories(['pyapi'])
     @expectedFlakeyNetBSD
+    @skipIfWindows # This test is flaky on Windows
     def test_python(self):
         """Test that we obey thread conditioned breakpoints."""
         self.build()
         exe = self.getBuildArtifact("a.out")
 
         target = self.dbg.CreateTarget(exe)
         self.assertTrue(target, VALID_TARGET)
 

lldb/test/API/python_api/lldbutil/iter/TestLLDBIterator.py

def test_lldb_iter_breakpoint(self):
         self.assertEqual(len(yours), len(mine))
         for i in range(len(yours)):
             if self.TraceOn():
                 print("yours[%d]='%s'" % (i, get_description(yours[i])))
                 print("mine[%d]='%s'" % (i, get_description(mine[i])))
             self.assertEqual(yours[i], mine[i],
                             "ID of yours[{0}] and mine[{0}] matches".format(i))
 
+    @skipIfWindows # This test is flaky on Windows
     def test_lldb_iter_frame(self):
         """Test iterator works correctly for SBProcess->SBThread->SBFrame."""
         self.build()
         exe = self.getBuildArtifact("a.out")
 
         target = self.dbg.CreateTarget(exe)
         self.assertTrue(target, VALID_TARGET)