[PATCH 4 of 9 V3] manifest: add manifestlog.add

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1474399441 25200
#      Tue Sep 20 12:24:01 2016 -0700
# Node ID 8cf5f24c100e58ece712703d0e4bb0746bc3087e
# Parent  7df972d2d43fe655ffcfdef9e2efedda8a684af8
manifest: add manifestlog.add

This adds a simple add() function to manifestlog. This let's us convert more
uses of repo.manifest to use repo.manifestlog, so we can further break our
dependency on the manifest class.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1732,9 +1732,9 @@ class localrepository(object):
                 drop = [f for f in removed if f in m]
                 for f in drop:
                     del m[f]
-                mn = self.manifest.add(m, trp, linkrev,
-                                       p1.manifestnode(), p2.manifestnode(),
-                                       added, drop)
+                mn = self.manifestlog.add(m, trp, linkrev,
+                                          p1.manifestnode(), p2.manifestnode(),
+                                          added, drop)
                 files = changed + removed
             else:
                 mn = p1.manifestnode()
diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -1049,6 +1049,9 @@ class manifestlog(object):
             self._mancache[node] = m
         return m
 
+    def add(self, m, transaction, link, p1, p2, added, removed):
+        return self._revlog.add(m, transaction, link, p1, p2, added, removed)
+
 class manifestctx(object):
     """A class representing a single revision of a manifest, including its
     contents, its parent revs, and its linkrev.