BUG#13001711: UNINITIALIZED VALUE IN MASTER_INFO::CLEAR_IN_MEMORY_INFO

WITH MYSQL_REFRESH()

reset_slave_info.all was not initialized.

We fix this by setting lex->reset_slave_info.all= false in
the lex_start routine, which is called before every statement.

sql/sql_lex.cc

@@ -435,6 +435,7 @@ void lex_start(THD *thd)
 
   lex->is_lex_started= TRUE;
   lex->used_tables= 0;
+  lex->reset_slave_info.all= false;
   DBUG_VOID_RETURN;
 }