Fix cgraph_address_taken_from_non_vtable_p

[Jan Hubicka]

Hi,
this patch fixes thinko in cgraph_address_taken_from_non_vtable_p that valks
references in NODE instead of references of NODE.
It fixes the testcase in http://sourceware.org/bugzilla/show_bug.cgi?id=12942
in non-plugin LTO and Gold, but not with GNU LD that presently handle resolution
info incorrectly for comdats.

Dave, do you think you could fix the GNU LD issue?

Once fixed, I wonder if I should not add the testcase as
lto/broken_comdat_in_gnu_ld.c or something similar like we have testcases for
glibc/mpfr bugs?

Bootstrapped/regtested x86_64-linux, comitted.

Index: ChangeLog
===================================================================
--- ChangeLog   (revision 175554)
+++ ChangeLog   (working copy)
@@ -1,3 +1,8 @@
+2011-06-27  Jan Hubicka  <j...@suse.cz>
+
+       * ipa.c (cgraph_address_taken_from_non_vtable_p): Walk references of 
node
+       instead of references in node.
+
 2011-06-27  Richard Henderson  <r...@redhat.com>
 
        * config/alpha/alpha.c (vms_patch_builtins): Provide dummy definition.
Index: ipa.c
===================================================================
--- ipa.c       (revision 175554)
+++ ipa.c       (working copy)
@@ -542,13 +542,13 @@ 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++)
+  for (i = 0; ipa_ref_list_refering_iterate (&node->ref_list, i, ref); i++)
     if (ref->use == IPA_REF_ADDR)
       {
        struct varpool_node *node;
-       if (ref->refered_type == IPA_REF_CGRAPH)
+       if (ref->refering_type == IPA_REF_CGRAPH)
          return true;
-       node = ipa_ref_varpool_node (ref);
+       node = ipa_ref_refering_varpool_node (ref);
        if (!DECL_VIRTUAL_P (node->decl))
          return true;
       }