localrepo: add git extension to autoextensions list

localrepo: add git extension to autoextensions list

Differential Revision: https://phab.mercurial-scm.org/D8266

--- a/mercurial/localrepo.py	Sat Mar 07 17:44:55 2020 -0500
+++ b/mercurial/localrepo.py	Sat Mar 07 18:00:53 2020 -0500
@@ -699,6 +699,7 @@
     # Map of requirements to list of extensions to load automatically when
     # requirement is present.
     autoextensions = {
+        b'git': [b'git'],
         b'largefiles': [b'largefiles'],
         b'lfs': [b'lfs'],
     }