[lldb][test] Mark gtest cases as XFAIL if the test is XFAIL

When a test case inside of a gtest suite fails, we report a failure
which causes the entire `ninja check-lldb` invocation to fail, even
if the outer test case is marked as XFAIL. This change checks whether
each test case's parent test suite is XFAIL before setting the status
to FAIL.

Author: kendal

llvm/utils/lit/lit/formats/googletest.py

@@ -334,7 +334,7 @@ def remove_gtest(tests):
                             returnCode = lit.Test.SKIPPED
                         elif "failures" in testinfo:
                             has_failure_in_shard = True
-                            returnCode = lit.Test.FAIL
+                            returnCode = lit.Test.XFAIL if test.isExpectedToFail() else lit.Test.FAIL
                             output = header
                             for fail in testinfo["failures"]:
                                 output += fail["failure"] + "\n"