[glib] (4 commits) Non-fast-forward update to branch finalize-speedups

[Matthias Clasen <matthiasc src gnome org>]

The branch 'finalize-speedups' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  a776553... Add g_datalist_id_remove_multiple
  b7ea3ef... gobject: Use g_datalist_id_remove_multiple
  ef91199... gobject: Don't do duplicate work
  a1f32ee... gobject: Speed up finalization

Commits added to the branch:

  0415bf9... Add g_datalist_id_remove_multiple
  fa8c7c0... gobject: Use g_datalist_id_remove_multiple
  488bdb8... gobject: Don't do duplicate work
  f22c267... gobject: Speed up finalization