Fix leak in gcc/tree-ssa-reassoc.c.

	* tree-ssa-reassoc.c (eliminate_duplicate_pair): Truncate
	an auto_vec instead of re-creating it.

From-SVN: r236466

gcc/ChangeLog

 2016-05-19  Martin Liska  <mliska@suse.cz>
 
+	* tree-ssa-reassoc.c (eliminate_duplicate_pair): Truncate
+	an auto_vec instead of re-creating it.
+
+2016-05-19  Martin Liska  <mliska@suse.cz>
+
 	* tree-ssa-loop-prefetch.c (determine_loop_nest_reuse): Use
 	auto_vec instead of vec.
 

gcc/tree-ssa-reassoc.c

@@ -732,7 +732,7 @@ eliminate_duplicate_pair (enum tree_code opcode,
 
 	  if (ops->length () == 2)
 	    {
-	      ops->create (0);
+	      ops->truncate (0);
 	      add_to_ops_vec (ops, build_zero_cst (TREE_TYPE (last->op)));
 	      *all_done = true;
 	    }