wireproto: don't format a debug string inside a hot loop

This improves stream_out performance by about 5%.

mercurial/wireproto.py

@@ -548,11 +548,13 b' def stream(repo, proto):'
 
         sopener = repo.sopener
         oldaudit = sopener.mustaudit
+        debugflag = repo.ui.debugflag
         sopener.mustaudit = False
 
         try:
             for name, size in entries:
-                repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
+                if debugflag:
+                    repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
                 # partially encode name over the wire for backwards compat
                 yield '%s\0%d\n' % (store.encodedir(name), size)
                 if size <= 65536:

tests/test-check-code-hg.t

@@ -6,7 +6,7 b''
   >     exit 80
   > fi
   $ hg manifest | xargs "$check_code" || echo 'FAILURE IS NOT AN OPTION!!!'
-  mercurial/wireproto.py:560:
+  mercurial/wireproto.py:562:
    >                     yield sopener(name).read(size)
    use opener.read() instead
   FAILURE IS NOT AN OPTION!!!