[Dwarf Patch] Use offset into debug_info for pubtype name referring to pubtype section

[Cary Coutant]

> gcc/ChangeLog
>
> 2013-12-02 Sterling Augustine  <saugustine@google.com>
>
>         * dwarf2out.c (output_pubnames): Use comp_unit_die ()->die_offset
> when there
>         isn't a skeleton die.

This is OK, but your patch also has a local change to contrib/mklog.
Please be careful not to commit that.

Thanks!

-cary