[PATCH] gold: Remove ei_class from mips.cc.

[Vladimir Radosavljevic]

This patch removes ei_class from mips.cc, and changes the way how to check for N64 ABI.
Depends on https://sourceware.org/ml/binutils/2016-03/msg00221.html.

Regards,
Vladimir.

ChangeLog -

    * elfcpp/mips.h (abi_64): Remove.
    * gold/mips.cc (Mips_relobj::Mips_relobj): Set is_n64_ by checking
    template parameter size.
    (Target_mips::is_output_n64): Change checking for N64 ABI.
    (Target_mips::ei_class_): Remove.
    (Target_mips::merge_processor_specific_flags): Remove ei_class
    argument, and remove comparing ei_class.
    (Target_mips::do_adjust_elf_header): Remove setting EI_CLASS field
    of the ELF header.
    (Target_mips::do_finalize_sections): Don't pass ei_class argument
    to merge_processor_specific_flags.
    (Target_mips::elf_mips_abi_name): Remove ei_class argument, and
    change checking for N64 ABI.
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