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Allow references to symbols with user specified DEFAULT bisibility


Hi,
while implementing checks in can_refer_decl_in_current_unit_p I had primarily symbols
with HIDDEN visibility in mind.  I just noticed that libstdc++ makes quite few symbols
with default visbility specified by hand.  I see no reason for disabling optimization
here.

Bootstrapped/regtested x86_64-linux, OK?

	* gimple-fold.c (can_refer_decl_in_current_unit_p): Allow references to
	symbols with user specified default visibility.
 
Index: gimple-fold.c
===================================================================
--- gimple-fold.c	(revision 207450)
+++ gimple-fold.c	(working copy)
@@ -114,6 +114,7 @@ can_refer_decl_in_current_unit_p (tree d
      unit may be in separate DSO and the symbol may be hidden.  */
   if (DECL_VISIBILITY_SPECIFIED (decl)
       && DECL_EXTERNAL (decl)
+      && DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT
       && (!(snode = symtab_get_node (decl)) || !snode->in_other_partition))
     return false;
   /* When function is public, we always can introduce new reference.


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