Move code around, in prep for Thai/Lao shaper
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index 4292222..06d4912 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -131,6 +131,11 @@
 			      unsigned int cluster_start,
 			      unsigned int cluster_end);
 
+  HB_INTERNAL void merge_clusters (unsigned int start,
+				   unsigned int end);
+  HB_INTERNAL void merge_out_clusters (unsigned int start,
+				       unsigned int end);
+
   /* Internal methods */
   HB_INTERNAL bool enlarge (unsigned int size);