Fix Mozilla LTO build

[Jan Hubicka]

Hi,
Mozilla LTO build broke due because symtab_remove_unreachable_nodes incorrectly 
removes origins of clones
in some special cases.

Bootstrapped/regtested x97_64-linux and comitted.
Index: ipa.c
===================================================================
--- ipa.c       (revision 187375)
+++ ipa.c       (working copy)
@@ -310,12 +310,12 @@ symtab_remove_unreachable_nodes (bool be
 
          /* For non-inline clones, force their origins to the boundary and 
ensure
             that body is not removed.  */
-         while (cnode->clone_of && !cnode->clone_of->symbol.aux
+         while (cnode->clone_of
                 && !gimple_has_body_p (cnode->symbol.decl))
            {
              bool noninline = cnode->clone_of->symbol.decl != 
cnode->symbol.decl;
              cnode = cnode->clone_of;
-             if (noninline && !cnode->symbol.aux)
+             if (noninline)
                {
                  pointer_set_insert (body_needed_for_clonning, 
cnode->symbol.decl);
                  enqueue_node ((symtab_node)cnode, &first, reachable);