The ideea is to perform the compiling tests (e.g. Sudoku, Iptables) on QEMU images with different RAM sizes (e.g. 128, 256, 512) to reveal possible memory issues like: https://bugzilla.yoctoproject.org/show_bug.cgi?id=5133
This would be hard to implement and we've not see any further issues like this so we don't plan to do this at this time.