[gold] First patch for aarch64 backend

[Cary Coutant]

I've committed the attached patch on your behalf. Thanks, and looking
forward to more aarch64 patches!

-cary

2014-07-02  Jing Yu  <jingyu@google.com>

    Initial patch to enable gold aarch64 backend.

    This patch is just a skeleton which almost does nothing.
    It does not support ILP32 now.

    gold/ChangeLog:
        * aarch64.cc: New file
        * Makefile.am (TARGETSOURCES): Add aarch64.cc
        (ALL_TARGETOBJS): Add aarch64.$(OBJEXT)
        * Makefile.in: Regenerate.
        * configure.tgt: Add entries for aarch64*.
        * configure.ac:  Likewise.
        * configure: Likewise.

    elfcpp/ChangeLog:
        * aarch64.h: New file. New enums for aarch64-elf64 relocations.
        * elfcpp.h (EM_AARCH64, SHT_AARCH64_ATTRIBUTES, PT_AARCH64_ARCHEXT,
        PT_AARCH64_UNWIND): New enum constant.
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