Merge: phase: remove a useless verbose line

Was called nb_classdefs*nb_phases times, so approximatively 50.000 for nitg.
Without it, the gain is 6% in compiling nitg

Pull-Request: #670
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>