Add SortedArray{16,32}Of<>

src/hb-open-type.hh

diff --git a/src/hb-open-type.hh b/src/hb-open-type.hh
index 6220501..ab25e96 100644
--- a/src/hb-open-type.hh
+++ b/src/hb-open-type.hh
@@ -891,7 +891,7 @@
 };
 
 /* An array with sorted elements.  Supports binary searching. */
-template <typename Type, typename LenType=HBUINT16>
+template <typename Type, typename LenType>
 struct SortedArrayOf : ArrayOf<Type, LenType>
 {
   hb_sorted_array_t<      Type> as_array ()       { return hb_sorted_array (this->arrayZ, this->len); }
@@ -942,6 +942,9 @@
   { return as_array ().bfind (x, i, not_found, to_store); }
 };
 
+template <typename Type> using SortedArray16Of = SortedArrayOf<Type, HBUINT16>;
+template <typename Type> using SortedArray32Of = SortedArrayOf<Type, HBUINT32>;
+
 /*
  * Binary-search arrays
  */