joomla/joomla-platform — pull request #1370 by realityking (2012-07-15 00:44:51+00:00)
Title: Remove workarounds in JProfiler::getMemory() for when memory_get_usage() is not available. 

According to the PHP documentation memory_get_usage() is always available since 5.2.1.
http://php.net/manual/de/function.memory-get-usage.php