re PR rtl-optimization/84308 (Memory leak in spread_components)

	PR rtl-optimization/84308
	* shrink-wrap.c (spread_components): Release todo vector.

From-SVN: r257544

gcc/ChangeLog

+2018-02-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/84308
+	* shrink-wrap.c (spread_components): Release todo vector.
+
 2018-02-09  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/57193

gcc/shrink-wrap.c

@@ -1370,6 +1370,8 @@ spread_components (sbitmap components)
       bitmap_clear_bit (seen, bb->index);
     }
 
+  todo.release ();
+
   /* Finally, mark everything not not needed both forwards and backwards.  */
 
   FOR_EACH_BB_FN (bb, cfun)