Bug#34306: Can't make copy of log tables when server binary log is enabled

Post-merge bug fix: lock_type is a enumeration type and not a bit mask.

sql/sql_cache.cc:
  Check for lock type explicitly. Also err on the safe side and
  invalidate the query cache for any write lock.

sql/sql_cache.cc

@@ -1542,10 +1542,9 @@ void Query_cache::invalidate_locked_for_write(TABLE_LIST *tables_used)
   for (; tables_used; tables_used= tables_used->next_local)
   {
     thd_proc_info(thd, "invalidating query cache entries (table)");
-    if (tables_used->lock_type & (TL_WRITE_LOW_PRIORITY | TL_WRITE) &&
+    if (tables_used->lock_type >= TL_WRITE_ALLOW_WRITE &&
         tables_used->table)
     {
-      THD *thd= current_thd; 
       invalidate_table(thd, tables_used->table);
     }
   }