message: [lit] Fix lldbtest format
  The lldbtest format was incorrectly detecting XFAIL as FAIL because it
  was looking for the `FAIL:` substring in the dotest output.
diff: @@ -94,8 +94,11 @@ class LLDBTest(TestFormat):
  litConfig.maxIndividualTestTime))
  if exitCode:
  - if 'FAIL:' in out or 'FAIL:' in err:
  + # Match FAIL but not XFAIL.
  + for line in out.splitlines() + err.splitlines():
  + if line.startswith('FAIL:'):
  return lit.Test.FAIL, out + err
  +
  if 'XPASS:' in out or 'XPASS:' in err:
  return lit.Test.XPASS, out + err
  