[PATCH 7 of 8] bookmark: directly use base dict 'setitem'

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at octobus.net>
# Date 1496859189 -3600
#      Wed Jun 07 19:13:09 2017 +0100
# Node ID 991d87aea4949f735920ef486aea59e1f727d18d
# Parent  b90c61451056ee0f8106b248559d48a7fb81690b
# EXP-Topic perf
# Available At https://www.mercurial-scm.org/repo/users/marmoute/mercurial/
#              hg pull https://www.mercurial-scm.org/repo/users/marmoute/mercurial/ -r 991d87aea494
bookmark: directly use base dict 'setitem'

The bmstore '__setitem__' method is setting and extra flag that is not needed
during initialization. Skipping the method will allow further cleanup and yield
some speedup as a side effect.

Before:
! wall 0.009120 comb 0.010000 user 0.010000 sys 0.000000 (best of 312)

After:
! wall 0.007874 comb 0.010000 user 0.010000 sys 0.000000 (best of 360)

diff --git a/mercurial/bookmarks.py b/mercurial/bookmarks.py
--- a/mercurial/bookmarks.py
+++ b/mercurial/bookmarks.py
@@ -52,6 +52,7 @@ class bmstore(dict):
         self._repo = repo
         nm = repo.changelog.nodemap
         tonode = bin #force local lookup
+        setitem = dict.__setitem__
         try:
             bkfile = _getbkfile(repo)
             for line in bkfile:
@@ -63,7 +64,7 @@ class bmstore(dict):
                     node = tonode(sha)
                     if node in nm:
                         refspec = encoding.tolocal(refspec)
-                        self[refspec] = node
+                        setitem(self, refspec, node)
                 except (TypeError, ValueError):
                     # - bin(...) can raise TypeError
                     # - node in nm can raise ValueError for non-20-bytes entry