[PATCH 3/6] gold: Add s390 backend.

[Cary Coutant]

>  configure                       |    2 +-
>  configure.ac                    |    2 +-

The top-level configure changes will need to be a separate patch, as
they need approval from a global maintainer. I'll combine that with
the mips and aarch64 configure patches that are still pending
approval, and try to get all three of those changes in.

>  elfcpp/s390.h                   |  118 ++
>  gold/Makefile.am                |    5 +-
>  gold/Makefile.in                |   10 +-
>  gold/configure                  |   15 +
>  gold/configure.ac               |    2 +
>  gold/configure.tgt              |   14 +
>  gold/s390.cc                    | 4241 +++++++++++++++++++++++++++++++++++++++
>  gold/testsuite/icf_safe_test.sh |    2 +-

This looks good. I've fixed a few style violations, and will commit it
for you with the following ChangeLog entry:

2015-10-28  Marcin Kościelnicki  <koriakin@0x04.net>

elfcpp/
        * s390.h: New file.

gold/
        * s390.cc: New file.
        * Makefile.am (TARGETSOURCES): Add s390.cc.
        (ALL_TARGETOBJS): Add s390.o.
        * Makefile.in: Regenerate.
        * configure.ac: Add s390 support.
        * configure: Regenerate.
        * configure.tgt: Add s390-*-* and s390x-*-*.
        * testsuite/icf_safe_test.sh (arch_specific_safe_fold): Add s390
        support.

Thanks, and sorry it took so long!

-cary