[google/gcc-4_8] Add support for .debug_gnu_pubnames/pubtypes section.

[Cary Coutant]

This patch is ported from the google/gcc-4_7 branch.

Tested with crosstool_validate.py and committed.

-cary


include:

2012-08-20  Sterling Augustine  <saugust...@google.com>

        * gdb/gdb-index.h: Check in from src.

gcc:

2012-08-20  Sterling Augustine  <saugust...@google.com>

        * dwarf2out.c (DEBUG_PUBNAMES_SECTION, DEBUG_PUBTYPES_SECTION): Adjust
        macros.
        (is_java, include_pubname_in_output): New functions.
        (size_of_pubnames): Call include_pubname_in_output.  New variable
        space_for_flags.
        (output_pubnames): Refactor, moving most of the logic to...
        (output_pubname): ... here.  New function.
        (dwarf2out_finish): Move output pubtable logic to...
        (output_pubtables): ... here.  New function.
        * common.opt (ggnu-pubnames):  New option.
        (gpubnames, gno-pubnames): Adjust.
        * opts.c (finish_options): Require -ggnu-pubnames when -gsplit-dwarf
        is set.
        * doc/invoke.texi: Document -ggnu-pubnames.