[ot] Simplify form_clusters()
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index ced748f..32d5a5f 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -189,7 +189,14 @@
unsigned int cluster_end);
HB_INTERNAL void merge_clusters (unsigned int start,
- unsigned int end);
+ unsigned int end)
+ {
+ if (end - start < 2)
+ return;
+ merge_clusters_impl (start, end);
+ }
+ HB_INTERNAL void merge_clusters_impl (unsigned int start,
+ unsigned int end);
HB_INTERNAL void merge_out_clusters (unsigned int start,
unsigned int end);
/* Merge clusters for deleting current glyph, and skip it. */
