FYI the random hanging/looping forever is now fixed in Ar Tonelico, all the Atelier games, and every other PhyreEngine game that had the problem. Save/load is still broken, but otherwise they are playable with LLVM. Enjoy!
Asus N55SF, i7-2670QM (~2,8 ghz under typical load), GeForce GT 555M (only OpenGL)