Do not use call _cache_get_object() to clear cache

The currently used code is the following one.

foreach ($clears as $bin => $cids) {
  $cache = _cache_get_object($bin);
  foreach ($cids as $serialized_cid => $wildcard) {
    $cache->clear(unserialize($serialized_cid), $wildcard);
  }
}

Instead of calling a function, and then a method on the returned object, it sufficient to call cache_clear_all().

foreach ($clears as $bin => $cids) {
  foreach ($cids as $serialized_cid => $wildcard) {
    cache_clear_all(unserialize($serialized_cid), $bin, $wildcard);
  }
}