[PATCH] add section alignment/size hooks to gold plugin interface, revised

[Cary Coutant]

> include/
> 2016-02-26  Than McIntosh <thanm@google.com>
>
>         * plugin-api.h: Add new hooks to the plugin transfer vector to
>         to support querying section alignment and section size.
>         (ld_plugin_get_input_section_alignment): New hook.
>         (ld_plugin_get_input_section_size): New hook.
>         (ld_plugin_tag): Add LDPT_GET_INPUT_SECTION_ALIGNMENT
>           and LDPT_GET_INPUT_SECTION_SIZE.
>         (ld_plugin_tv): Add tv_get_input_section_alignment and
>           tv_get_input_section_size.
>
> gold/
> 2016-02-26  Than McIntosh  <thanm@google.com>
>
>         * plugin.cc (Plugin::load): Include hooks for get_input_section_size
>         and get_input_section_alignment in transfer vector.
>         (get_input_section_alignment): New function.
>         (get_input_section_size): New function.
>         * testsuite/Makefile.am: Add plugin_layout_with_alignment.sh test.
>         * testsuite/Makefile.in: [Regenerate.]
>         * testsuite/plugin_section_alignment.cc: New test file.
>         * testsuite/plugin_layout_with_alignment.cc: New test file.
>         * testsuite/plugin_layout_with_alignment.sh: New test file.

I've committed the attached patch on your behalf. There was another
plugin patch, so I had to renumber the LDPT values.

-cary
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