re PR bootstrap/47402 (Bootstrap comparison failure)

PR debug/47402
Temporarily revert:
2011-01-21  Alexandre Oliva  <aoliva@redhat.com>
PR debug/47106
* tree-dfa.c (create_var_ann): Mark variable as used.

From-SVN: r169107

gcc/ChangeLog

+2011-01-21  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR debug/47402
+	Temporarily revert:
+	2011-01-21  Alexandre Oliva  <aoliva@redhat.com>
+	PR debug/47106
+	* tree-dfa.c (create_var_ann): Mark variable as used.
+
 2011-01-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/45566

gcc/tree-dfa.c

@@ -137,9 +137,6 @@ create_var_ann (tree t)
   ann = ggc_alloc_cleared_var_ann_d ();
   *DECL_VAR_ANN_PTR (t) = ann;
 
-  /* Assume the variable is used, at least for now.  */
-  ann->used = true;
-
   return ann;
 }