Move an use-after-free access before the delete.

    gcc/
	PR target/80671
	* config/aarch64/cortex-a57-fma-steering.c (merge_forest):
	Move member access before delete.

From-SVN: r247831

gcc/ChangeLog

+2017-05-10  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	PR target/80671
+	* config/aarch64/cortex-a57-fma-steering.c (merge_forest):
+	Move member access before delete.
+
 2017-05-10  Alexandre Oliva <aoliva@redhat.com>
 
 	* tree-inline.c (expand_call_inline): Split block at stmt

gcc/config/aarch64/cortex-a57-fma-steering.c

@@ -411,9 +411,9 @@ fma_forest::merge_forest (fma_forest *other_forest)
      the list of tree roots of ref_forest.  */
   this->m_globals->remove_forest (other_forest);
   this->m_roots->splice (this->m_roots->begin (), *other_roots);
-  delete other_forest;
-
   this->m_nb_nodes += other_forest->m_nb_nodes;
+
+  delete other_forest;
 }
 
 /* Dump information about the forest FOREST.  */