make fold ignore decl_with_vis.symtab_node

gcc/

	PR middle-end/63325
	* fold-const.c (fold_checksum_tree): Don't include
	expr.decl_with_vis.symtab_node in the checksum.

From-SVN: r219994

gcc/ChangeLog

+2015-01-22  Trevor Saunders  <tsaunders@mozilla.com>
+
+	PR middle-end/63325
+	* fold-const.c (fold_checksum_tree): Don't include value of
+	expr->decl_with_vis.symtab_node in the checksum.
+
 2015-01-22  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
 	* config/s390/s390.md (atomic code attribute): Fix typo "ior" ->

gcc/fold-const.c

@@ -14073,11 +14073,12 @@ fold_checksum_tree (const_tree expr, struct md5_ctx *ctx,
   *slot = expr;
   code = TREE_CODE (expr);
   if (TREE_CODE_CLASS (code) == tcc_declaration
-      && DECL_ASSEMBLER_NAME_SET_P (expr))
+      && HAS_DECL_ASSEMBLER_NAME_P (expr))
     {
-      /* Allow DECL_ASSEMBLER_NAME to be modified.  */
+      /* Allow DECL_ASSEMBLER_NAME and symtab_node to be modified.  */
       memcpy ((char *) &buf, expr, tree_size (expr));
       SET_DECL_ASSEMBLER_NAME ((tree)&buf, NULL);
+      buf.decl_with_vis.symtab_node = NULL;
       expr = (tree) &buf;
     }
   else if (TREE_CODE_CLASS (code) == tcc_type