re PR middle-end/56461 (GCC is leaking lots of memory)

	PR middle-end/56461
	* tree-vect-stmts.c (vect_create_vectorized_promotion_stmts): Call
	vec_oprnds0->release (); rather than vec_oprnds0->truncate (0)
	before overwriting it.

From-SVN: r196393

gcc/ChangeLog

+2013-03-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/56461
+	* tree-vect-stmts.c (vect_create_vectorized_promotion_stmts): Call
+	vec_oprnds0->release (); rather than vec_oprnds0->truncate (0)
+	before overwriting it.
+
 2013-03-01  Tobias Burnus  <burnus@net-b.de>
 
 	* doc/extended.texi (C Extensions): Change order in @menu

gcc/tree-vect-stmts.c

@@ -2269,7 +2269,7 @@ vect_create_vectorized_promotion_stmts (vec<tree> *vec_oprnds0,
       vec_tmp.quick_push (new_tmp2);
     }
 
-  vec_oprnds0->truncate (0);
+  vec_oprnds0->release ();
   *vec_oprnds0 = vec_tmp;
 }