tests/test-revlog-packentry.t

store: optimize fncache._load a bit by dirdecoding the contents in one go

For a netbeans clone on Windows 7 x64:

  Before:
    $ hg perffncacheload
    ! wall 0.124000 comb 0.124801 user 0.124801 sys 0.000000 (best of 76)

  After:
    $ hg perffncacheload
    ! wall 0.096000 comb 0.093601 user 0.078001 sys 0.015600 (best of 97)

  $ hg init repo
  $ cd repo

  $ touch foo
  $ hg ci -Am 'add foo'
  adding foo

  $ hg up -C null
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

this should be stored as a delta against rev 0

  $ echo foo bar baz > foo
  $ hg ci -Am 'add foo again'
  adding foo
  created new head

  $ hg debugindex foo
     rev    offset  length  ..... linkrev nodeid       p1           p2 (re)
       0         0       0  .....       0 b80de5d13875 000000000000 000000000000 (re)
       1         0      24  .....       1 0376abec49b8 000000000000 000000000000 (re)

  $ cd ..