[gsubgpos] Avoid a copy into the vector

src/hb-ot-layout-gsubgpos.hh

@@ -957,9 +957,9 @@ struct hb_accelerate_subtables_context_t :
   template <typename T>
   return_t dispatch (const T &obj)
   {
-    hb_applicable_t entry;
+    hb_applicable_t *entry = array.push ();
 
-    entry.init (obj,
+    entry->init (obj,
 		 apply_to<T>
 #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE
 		 , apply_cached_to<T>
@@ -967,8 +967,6 @@ struct hb_accelerate_subtables_context_t :
 #endif
 		 );
 
-    array.push (entry);
-
 #ifndef HB_NO_OT_LAYOUT_LOOKUP_CACHE
     /* Cache handling
      *