revlog: use rust rank computation if available

Differential Revision: https://phab.mercurial-scm.org/D12212

mercurial/revlog.py

@@ -2471,6 +2471,9 b' class revlog(object):'
             elif p1r == nullrev and p2r != nullrev:
                 rank = 1 + self.fast_rank(p2r)
             else:  # merge node
+                if rustdagop is not None and self.index.rust_ext_compat:
+                    rank = rustdagop.rank(self.index, p1r, p2r)
+                else:
                 pmin, pmax = sorted((p1r, p2r))
                 rank = 1 + self.fast_rank(pmax)
                 rank += sum(1 for _ in self.findmissingrevs([pmax], [pmin]))