LVU: defer *leb128 expression

Without deferring, we use unresolved values, and that won't do for
views involving relaxations.

gas/read.c

@@ -5398,7 +5398,7 @@ s_leb128 (int sign)
 
   do
     {
-      expression (&exp);
+      deferred_expression (&exp);
       emit_leb128_expr (&exp, sign);
     }
   while (*input_line_pointer++ == ',');