obsfate: makes successorsetverb takes the markers as argument Right now, successorsetverb only needs successors to compute the verb. But we will want use additional information (effect-flags and operation) in the near future to compute a better verb. Add the markers parameter now so extensions (like Evolve) could wrap the function and start experimenting around better obsfate verbs. As successorsetverb now takes both successorset and markers parameters, rename it to obsfateverb, successorsetandmarkersverb was too long. Differential Revision: https://phab.mercurial-scm.org/D1191