mercurial/templates/map-cmdline.compact

revset: prefetch all attributes before loop in _revsbetween

Python is slow at attributes lookup. No, really, I mean -slow-. prefetching
these three methods give use a measurable performance boost.

revset #0: 0::tip
   plain
0) 0.037655
1) 0.034290  91%

changeset = '{rev}{tags}{bookmarks}{parents}   {node|short}   {date|isodate}   {author|user}\n  {desc|firstline|strip}\n\n'
changeset_quiet = '{rev}:{node|short}\n'
changeset_verbose = '{rev}{tags}{parents}   {node|short}   {date|isodate}   {author}\n  {desc|strip}\n\n'
start_tags = '['
tag = '{tag},'
last_tag = '{tag}]'
start_parents = ':'
parent = '{rev},'
last_parent = '{rev}'
start_bookmarks = '['
bookmark = '{bookmark},'
last_bookmark = '{bookmark}]'