phabricator: post revisions in ascending topological order (issue6241)

The parent in phabricator ends up being the last revision posted, so sorting the
user input into ascending order should be enough to preserve the proper
relationships.

Differential Revision: https://phab.mercurial-scm.org/D7874

hgext/phabricator.py

@@ -1065,6 +1065,7 b' def phabsend(ui, repo, *revs, **opts):'
     opts = pycompat.byteskwargs(opts)
     revs = list(revs) + opts.get(b'rev', [])
     revs = scmutil.revrange(repo, revs)
+    revs.sort()  # ascending order to preserve topological parent/child in phab
 
     if not revs:
         raise error.Abort(_(b'phabsend requires at least one changeset'))