merge from gcc

libiberty/ChangeLog

+2009-06-21  Jakub Jelinek  <jakub@redhat.com>
+
+	* hashtab.c (htab_traverse): Don't call htab_expand for
+	nearly empty hashtabs with sizes 7, 13 or 31.
+
 2009-06-16  Nick Clifton  <nickc@redhat.com>
 
 	PR 10197

libiberty/hashtab.c

 /* An expandable hash tables datatype.  
-   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
+   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2009
    Free Software Foundation, Inc.
    Contributed by Vladimir Makarov (vmakarov@cygnus.com).
 
@@ -759,7 +759,8 @@ htab_traverse_noresize (htab_t htab, htab_trav callback, PTR info)
 void
 htab_traverse (htab_t htab, htab_trav callback, PTR info)
 {
-  if (htab_elements (htab) * 8 < htab_size (htab))
+  size_t size = htab_size (htab);
+  if (htab_elements (htab) * 8 < size && size > 32)
     htab_expand (htab);
 
   htab_traverse_noresize (htab, callback, info);