[lldb][test] Fix libc++ API tests on older Clang versions

Both of these fail on our Clang-19 macOS bots.

Author: Michael137

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/optional/TestDataFormatterLibcxxOptionalSimulator.py

@@ -53,6 +53,8 @@ def _run_test(self, defines):
     # causing this test to fail. This was reverted in newer version of clang
     # with commit 52a9ba7ca.
     @skipIf(compiler="clang", compiler_version=["=", "17"])
+    @skipIf(compiler="clang", compiler_version=["=", "18"])
+    @skipIf(compiler="clang", compiler_version=["=", "19"])
     @functools.wraps(LibcxxOptionalDataFormatterSimulatorTestCase._run_test)
     def test_method(self, defines=defines):
         LibcxxOptionalDataFormatterSimulatorTestCase._run_test(self, defines)

lldb/test/API/lang/cpp/libcxx-internals-recognizer/TestLibcxxInternalsRecognizer.py

@@ -9,7 +9,7 @@ class LibCxxInternalsRecognizerTestCase(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
     @add_test_categories(["libc++"])
-    @skipIf(compiler="clang", compiler_version=["<", "19.0"])
+    @skipIf(compiler="clang", compiler_version=["<=", "19.0"])
     def test_frame_recognizer(self):
         """Test that implementation details of libc++ are hidden"""
         self.build()