archival: fileit should not use atomictemp, causes performance regression

Differential Revision: https://phab.mercurial-scm.org/D2704

mercurial/archival.py

@@ -272,7 +272,7 b' class fileit(object):'
         if islink:
             self.opener.symlink(data, name)
             return
-        f = self.opener(name, "w", atomictemp=True)
+        f = self.opener(name, "w", atomictemp=False)
         f.write(data)
         f.close()
         destfile = os.path.join(self.basedir, name)