[subset-cff] Pre-size map in subr_remap_t::create()

src/hb-bimap.hh

@@ -39,6 +39,12 @@ struct hb_bimap_t
     back_map.reset ();
   }
 
+  void resize (unsigned pop)
+  {
+    forw_map.resize (pop);
+    back_map.resize (pop);
+  }
+
   bool in_error () const { return forw_map.in_error () || back_map.in_error (); }
 
   void set (hb_codepoint_t lhs, hb_codepoint_t rhs)

src/hb-subset-cff-common.hh

@@ -466,6 +466,7 @@ struct subr_remap_t : hb_inc_bimap_t
      * no optimization based on usage counts. fonttools doesn't appear doing that either.
      */
 
+    resize (closure->get_population ());
     hb_codepoint_t old_num = HB_SET_VALUE_INVALID;
     while (hb_set_next (closure, &old_num))
       add (old_num);