revlog: inline opener options logic into _loadindex() We always call _loadindex() during __init__. But we also call _loadindex() as part of censorrevision(). Before, when reloading the index during censorrevision(), we would lose the configured mmapindexthreshold setting from the opener. By inlining the logic in _loadindex(), we ensure that opener options are always respected when loading the index. Differential Revision: https://phab.mercurial-scm.org/D5563