Remove .eh_frame zero terminators

[H.J. Lu]

On Thu, Aug 31, 2017 at 3:35 AM, Alan Modra <amodra@gmail.com> wrote:
> The machinery to do this was there, but not enabled if the terminator
> was the only thing in the section.
>
> We should have seen quite a lot of exception handling failures due to
> ld's nasty LTO support.  It has the habit of adding object files
> extracted from archives after crtend.o, the file that has the
> .eh_frame terminator.  The saving grace is that with --eh-frame-hdr
> there doesn't need to be a scan of section contents (which would
> terminate on hitting the terminator) for an FDE covering a given
> address.
>
> bfd/
>         * elf-eh-frame.c (_bfd_elf_parse_eh_frame): Don't exit early
>         for a section containing just a terminator.  Allow multiple
>         terminators at end of section.
>         * elflink.c (bfd_elf_discard_info): Iterate over .eh_frame
>         sections when not adding alignment.  Assert on terminator in
>         the middle of FDEs.
> ld/
>         * testsuite/ld-elf/eh3.d: Update.
>         * testsuite/ld-elf/eh4.d: Update.
>

I am checking in this to add a testcase.

Thanks.

H.J.
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