Index: value-prof.c
===================================================================
--- value-prof.c	(revision 172977)
+++ value-prof.c	(working copy)
@@ -1086,8 +1086,9 @@ init_node_map (void)
 void
 del_node_map (void)
 {
-   VEC_free (cgraph_node_ptr, heap, cgraph_node_map);
-   cgraph_node_map = NULL;
+  if (cgraph_node_map)
+    VEC_free (cgraph_node_ptr, heap, cgraph_node_map);
+  cgraph_node_map = NULL;
 }

This is not necessary.  Freeing a NULL VEC has no effect.  You could