[PATCH] gold: Add do_print_to_mapfile function in Mips_output_data_la25_stub class.

[Cary Coutant]

> This patch adds missing implementation of do_print_to_mapfile function in Mips_output_data_la25_stub class.
>
>     * mips.cc (class Mips_output_data_la25_stub): Add
>     do_print_to_mapfile function.

Thanks! Committed.

-cary