fix comment

From-SVN: r29443

gcc/cp/typeck.c

@@ -1611,9 +1611,8 @@ expr_sizeof (e)
       return size_int (1);
     }
   /* It's illegal to say `sizeof (X::i)' for `i' a non-static data
-     member unless you're in a non-static member of X.  But, we used
-     to support this usage, so we still permit it unless we're being
-     pedantic.  [expr.prim]  */
+     member unless you're in a non-static member of X.  So hand off to
+     resolve_offset_ref.  [expr.prim]  */
   else if (TREE_CODE (e) == OFFSET_REF)
     e = resolve_offset_ref (e);