re PR ipa/65059 (Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360)

Fix PR ipa/65059.

	PR ipa/65059
	* ipa-comdats.c (ipa_comdats): Do not categorize thunks to
	external functions.

From-SVN: r220733

gcc/ChangeLog

+2015-02-16  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/65059
+	* ipa-comdats.c (ipa_comdats): Do not categorize thunks to
+	external functions.
+
 2015-02-15  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* doc/bugreport.texi: Adjust section titles throughout the file

gcc/ipa-comdats.c

@@ -328,9 +328,14 @@ ipa_comdats (void)
 
   FOR_EACH_DEFINED_SYMBOL (symbol)
     {
+      struct cgraph_node *fun;
       symbol->aux = NULL; 
       if (!symbol->get_comdat_group ()
 	  && !symbol->alias
+	  /* Thunks to external functions do not need to be categorized.  */
+	  && (!(fun = dyn_cast <cgraph_node *> (symbol))
+	      || !fun->thunk.thunk_p
+	      || fun->function_symbol ()->definition)
 	  && symbol->real_symbol_p ())
 	{
 	  tree *val = map.get (symbol);