fix assert in hash_table pch routines

gcc/ChangeLog:

2014-09-12  Trevor Saunders  <tsaunders@mozilla.com>

	* hash-table.h (gt_pch_nx): don't call gt_pch_note_object within an
	assert.

From-SVN: r215216

gcc/ChangeLog

+2014-09-12  Trevor Saunders  <tsaunders@mozilla.com>
+
+	* hash-table.h (gt_pch_nx): don't call gt_pch_note_object within an
+	assert.
+
 2014-09-12  Joseph Myers  <joseph@codesourcery.com>
 
 	* target.def (libgcc_floating_mode_supported_p): New hook.

gcc/hash-table.h

@@ -1598,8 +1598,9 @@ template<typename D>
 static void
 gt_pch_nx (hash_table<D> *h)
 {
-  gcc_checking_assert (gt_pch_note_object (h->m_entries, h,
-					   hashtab_entry_note_pointers<D>));
+  bool success ATTRIBUTE_UNUSED
+    = gt_pch_note_object (h->m_entries, h, hashtab_entry_note_pointers<D>);
+  gcc_checking_assert (success);
   for (size_t i = 0; i < h->m_size; i++)
     {
       if (hash_table<D>::is_empty (h->m_entries[i])