[Gold Patch] Fix Gdb Index Generation from pubnames

[Cary Coutant]

> 2012-09-07  Sterling Augustine  <saugustine@google.com>
>
>         * gdb-index.cc (Gdb_index::pubnames_read): New parameter.
>         (Gdb_index::pubtypes_read): New parameter.
>         (Gdb_index_info_reader::read_pubnames_and_pubtypes): Add parameters
>         to calls.
>         * gdb-index.h (Gdb_index): New fields pubnames_object_ and
>         pubtypes_object_.

This is fine with me. Ian needs to approve.

Thanks!

-cary