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

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

Differential Revision: https://reviews.llvm.org/D114907

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

@@ -20,6 +20,7 @@ class ThreadSpecificBreakPlusConditionTestCase(TestBase):
     # 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()

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

@@ -89,6 +89,7 @@ class LLDBIteratorTestCase(TestBase):
             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()