Issue #2080311 by rhm50, amitgoyal, InternetDevels, Rajesh Ashok, pfrenssen, natemow, areke, chertzog | mrsinguyen: Clean up Drupal\system\Tests\Database\SelectTest.php.
Issue #2301975 by kim.pepper: Move drupal_is_front_page to PathMatcher service.
Issue #2301597 by joshi.rohit100: Remove drupal_prepare_form() as it is deprecated.
Issue #2300891 by joshi.rohit100: Remove format_backtrace() from error.inc as deprecated.