Fix ICE while updating inliner summary

[Jan Hubicka]

Hi,
this patch fix ICE seen when LTO optimizing clang.

Bootstrapped/regtested x86_64-linux.

	* ipa.c (walk_polymorphic_call_targets): Fix updating of overall
	summary.
Index: ipa.c
===================================================================
--- ipa.c	(revision 279724)
+++ ipa.c	(working copy)
@@ -244,7 +244,8 @@ walk_polymorphic_call_targets (hash_set<
 	    }
 	  edge = edge->make_direct (target);
 	  if (ipa_fn_summaries)
-	    ipa_update_overall_fn_summary (node);
+	    ipa_update_overall_fn_summary (node->inlined_to
+					   ? node->inlined_to : node);
 	  else if (edge->call_stmt)
 	    edge->redirect_call_stmt_to_callee ();
 	}