[PATCH v4] gold: Fix non-deterministic behaviour of Mips gold.

[Vladimir Radosavljevic]

Comments addressed.

Regards,
Vladimir

ChangeLog -

    * mips.cc (Mips_got_entry::Mips_got_entry): Remove object argument
    for global got symbols, and set addend to 0.
    (Mips_got_entry::hash): Change hash algorithm.
    (Mips_got_entry::equals): Refactor.
    (Mips_got_entry::object): Return input object for local got symbols
    from union d.
    (Mips_got_entry::addend): Change return of the relocation addend.
    (Mips_got_entry::addend_): Move from union d.
    (Mips_got_entry::object_): Move into union d.
    (class Mips_symbol_hash): New class.
    (Mips_got_info::Global_got_entry_set): New type.
    (Mips_got_info::global_got_symbols): Change return type to
    Global_got_entry_set.
    (Mips_got_info::global_got_symbols_): Change type to
    Global_got_entry_set.
    (Mips_symbol::hash): New method.
    (Mips_output_data_la25_stub::symbols_): Change type to std::vector.
    (Mips_output_data_mips_stubs::Mips_stubs_entry_set): New type.
    (Mips_output_data_mips_stubs::symbols_): Change type to
    Mips_stubs_entry_set.
    (Mips_got_info::record_global_got_symbol): Don't pass object
    argument when creating global got symbol.
    (Mips_got_info::record_got_entry): Remove find before inserting
    got entries.
    (Mips_got_info::add_reloc_only_entries): Change type of iterator
    to Global_got_entry_set.
    (Mips_got_info::count_got_symbols): Likewise.
    (Mips_output_data_la25_stub::create_la25_stub): Use push_back
    for adding entries to symbols_.
    (Mips_output_data_la25_stub::do_write): Change type of iterator
    to std::vector.
    (Mips_output_data_mips_stubs::set_lazy_stub_offsets): Change type
    of iterator to Mips_stubs_entry_set.
    (Mips_output_data_mips_stubs::set_needs_dynsym_value): Likewise.
    (Mips_output_data_mips_stubs::do_write): Likewise.
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