Merge "Move OrderedStreamingForkController class from CirrusSearch to core."

diff --combined autoload.php
index c7f13d5,531fa9c..5eba00b
--- 1/autoload.php
--- 2/autoload.php
+++ b/autoload.php
@@@ -1043,6 -1043,7 +1043,7 @@@ $wgAutoloadLocalClasses = 
        'OldLocalFile' => __DIR__ . '/includes/filerepo/file/OldLocalFile.php',
        'OracleInstaller' => __DIR__ . '/includes/installer/OracleInstaller.php',
        'OracleUpdater' => __DIR__ . '/includes/installer/OracleUpdater.php',
+       'OrderedStreamingForkController' => __DIR__ . '/includes/OrderedStreamingForkController.php',
        'OrphanStats' => __DIR__ . '/maintenance/storage/orphanStats.php',
        'Orphans' => __DIR__ . '/maintenance/orphans.php',
        'OutputPage' => __DIR__ . '/includes/OutputPage.php',
@@@ -1117,7 -1118,6 +1118,7 @@@
        'PopulateFilearchiveSha1' => __DIR__ . '/maintenance/populateFilearchiveSha1.php',
        'PopulateImageSha1' => __DIR__ . '/maintenance/populateImageSha1.php',
        'PopulateInterwiki' => __DIR__ . '/maintenance/populateInterwiki.php',
 +      'PopulateIpChanges' => __DIR__ . '/maintenance/populateIpChanges.php',
        'PopulateLogSearch' => __DIR__ . '/maintenance/populateLogSearch.php',
        'PopulateLogUsertext' => __DIR__ . '/maintenance/populateLogUsertext.php',
        'PopulatePPSortKey' => __DIR__ . '/maintenance/populatePPSortKey.php',