Instead of ParserOutput::$mIndexPolicy, a future MW version
(I683e5ae054a0425b03c60a4af8c845b576414c1d) will use two boolean fields
ParserOutput::$mIndexSet and ::$mNoIndexSet. For parser cache migration
purposes, ensure that core can deserialize the new version so that
rollback are safe.
Add serialization test cases with the new boolean fields as
"1.39_wmf.7-ParserOutput-*"; compatibility with the existing
"mIndexPolicy" serialization will continue to be tested with the
"1.38-ParserOutput-*" cases.
Change-Id: I5e4fc68cea18b31ecb028b3867537dcbd86b93cd
664012e23f