bug#10164: 24.0.91; Instant crash enabling linum-mode

[Eli Zaretskii]

> Arrgh!  This is GCC 4.6.x "as-is" code reordering in action.  Emacs
> crashes here:
> 
>             xassert (!row->enabled_p
>                      || row->mode_line_p
>                      || verify_row_hash (row));
> 
> Evidently, it calls verify_row_hash before it tests row->mode_line_p

Fixed in revision 106555 on the trunk.

Chong, I hope this is in time for the next pretest.  It would be a
pity to release a pretest with such a glaring problem.