Re: [google/main] Fix erroneous output of pubnames when no .debug_section is emitted. (issue5528054)

[Cary Coutant]

> Certain source files will not produce a .debug_info section. This patch to
> google/main adds a check for that case to output_pubnames, preventing a link
> failure.
>
> Tested:
>        By rebuild and bootstrap.
>
> ChangeLog:
>
> 2012-01-09   Sterling Augustine  <saugust...@google.com>
>
>        * gcc/dwarf2out.c (output_pubnames): Add check for 
> info_section_emitted.

LGTM.

-cary