AbuseLogLookup::getHitCountsForUsers filters the abuse log entries using just the user id (afl_user). However, createaccount and autocreateaccount actions have afl_user = 0 in their log entries, despite having the user name in afl_user_text.
The method should be changed so that it accepts an array of UserIdentity'ies and prepares the condition using AbuseLogConditionFactory.
This is similar to T213982