Merging new hash algorithm (crc32c) into PHP 7.3 and maybe 7.2?

Hi, I've recently sent a pull request <https://github.com/php/php-src/pull/3913>, to add a new hashing algorithm, <http://php.net/manual/en/function.hash.php> specific crc32c (Castagnoli's polynomial). This variant of crc32 is heavily used by storage systems, such as iSCSI, SCTP, Btrfs, ext4, and is increasingly being used in APIs (such as Google Cloud Storage, and Apache Kafka). The hash algorithm is small, and self contained. It cleaning merges against master, and the 7.2 branch. It was suggested that in addition to merging to 7.4, I could get approval to merge into 7.3 and maybe 7.2. This email is to get approval for which versions it can be merged into. thanks Andrew