index: use `index.has_node` in `infinitypush`

Differential Revision: https://phab.mercurial-scm.org/D7356

hgext/infinitepush/__init__.py

@@ -548,7 +548,7 b' def getbundlechunks(orig, repo, source, '
     allbundlestocleanup = []
     try:
         for head in heads:
-            if head not in repo.changelog.nodemap:
+            if not repo.changelog.index.has_node(head):
                 if head not in nodestobundle:
                     newbundlefile = common.downloadbundle(repo, head)
                     bundlepath = b"bundle:%s+%s" % (repo.root, newbundlefile)