[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:

  c6cadc3... Add g_datalist_id_remove_multiple
  e018629... gobject: Use g_datalist_id_remove_multiple
  b028775... gobject: Don't do duplicate work
  251d53b... gobject: Speed up finalization

Commits added to the branch:

  6c78040... Add g_datalist_id_remove_multiple
  697e297... gobject: Use g_datalist_id_remove_multiple
  de2f930... gobject: Don't do duplicate work
  458c7f8... gobject: Speed up finalization