nodemap: provide the on disk data to indexes who support it Time to start defining the API and prepare the rust index support. We provide a method to do so. We use a distinct method instead of passing them in the constructor because we will need this method anyway later (to refresh the mmap once we update the data on disk). Differential Revision: https://phab.mercurial-scm.org/D7847

nodemap: all check that revision and nodes match in the nodemap More check is always useful. Differential Revision: https://phab.mercurial-scm.org/D7846