Fix comdat unsharing

[Jan Hubicka]

Hi,
cgraph_address_taken_from_non_vtable_p was written with asumption that all 
references to functions
take addresses.  This is not true for aliases.

Bootstrapped/regtested x86_64-linux, comitted.

Honza

Index: ChangeLog
===================================================================
--- ChangeLog   (revision 175020)
+++ ChangeLog   (working copy)
@@ -1,3 +1,7 @@
+2011-06-13  Jan Hubicka  <j...@suse.cz>
+
+       * ipa.c (cgraph_address_taken_from_non_vtable_p): Check the ref type.
+
 2011-06-14  Richard Henderson  <r...@redhat.com>
 
        PR debug/48459
Index: ipa.c
===================================================================
--- ipa.c       (revision 175015)
+++ ipa.c       (working copy)
@@ -543,14 +543,15 @@ cgraph_address_taken_from_non_vtable_p (
   int i;
   struct ipa_ref *ref;
   for (i = 0; ipa_ref_list_reference_iterate (&node->ref_list, i, ref); i++)
-    {
-      struct varpool_node *node;
-      if (ref->refered_type == IPA_REF_CGRAPH)
-       return true;
-      node = ipa_ref_varpool_node (ref);
-      if (!DECL_VIRTUAL_P (node->decl))
-       return true;
-    }
+    if (ref->use == IPA_REF_ADDR)
+      {
+       struct varpool_node *node;
+       if (ref->refered_type == IPA_REF_CGRAPH)
+         return true;
+       node = ipa_ref_varpool_node (ref);
+       if (!DECL_VIRTUAL_P (node->decl))
+         return true;
+      }
   return false;
 }