fixUserRegistration.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class FixUserRegistration extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Fix the user_registration field";
        }

        public function execute() {
                $dbr = wfGetDB( DB_SLAVE );
                $dbw = wfGetDB( DB_MASTER );

                // Get user IDs which need fixing
                $res = $dbr->select( 'user', 'user_id', 'user_registration IS NULL', __METHOD__ );
                foreach ( $res as $row ) {
                        $id = $row->user_id;
                        // Get first edit time
                        $timestamp = $dbr->selectField( 'revision', 'MIN(rev_timestamp)', array( 'rev_user' => $id ), __METHOD__ );
                        // Update
                        if ( !empty( $timestamp ) ) {
                                $dbw->update( 'user', array( 'user_registration' => $timestamp ), array( 'user_id' => $id ), __METHOD__ );
                                $this->output( "$id $timestamp\n" );
                        } else {
                                $this->output( "$id NULL\n" );
                        }
                }
                $this->output( "\n" );
        }
}

$maintClass = "FixUserRegistration";
require_once( RUN_MAINTENANCE_IF_MAIN );