bundlerepo: properly handle hidden linkrev in manifestlog (issue4945)

The bundlerepository have to do some special magic to handle linkrev of the
bundled manifest. That logic was done from a repoview and obsolescence marker
affecting bundled changeset could lead to a crash. We now ensure we operate on
unfiltered repository.

mercurial/bundlerepo.py

@@ -325,7 +325,8 b' class bundlerepository(localrepo.localre'
         self.bundle.seek(self.manstart)
         # consume the header if it exists
         self.bundle.manifestheader()
-        m = bundlemanifest(self.svfs, self.bundle, self.changelog.rev)
+        linkmapper = self.unfiltered().changelog.rev
+        m = bundlemanifest(self.svfs, self.bundle, linkmapper)
         # XXX: hack to work with changegroup3, but we still don't handle
         # tree manifests correctly
         if self.bundle.version == "03":