[gold commit] Support compressed debug sections in dynamic object files

[Cary Coutant]

This patch adds support for reading compressed debug info in
shared objects. It actually simplifies things, by moving the
support for compressed sections all the way up to the top-level
Object class, eliminating the need for several virtual methods.

-cary


2015-03-21  Cary Coutant  <cary@google.com>

gold/
        * dwp.cc (Sized_relobj_dwo::do_section_contents): Delete.
        (Sized_relobj_dwo::setup): Build compressed section map.
        (Sized_relobj_dwo::do_decompressed_section_contents): Delete.
        * dynobj.cc (Sized_dynobj::base_read_symbols): Build compressed
        section map.
        * object.cc (Sized_relobj_file::Sized_relobj_file): Remove
        compressed_sections_ field.
        (build_compressed_section_map): Take Object instead of
        Sized_relobj_file parameter; add decompress_if_needed parameter.
        (Sized_relobj_file::do_find_special_sections): Store compressed
        section map in parent Object.
        (Sized_relobj_file::do_decompressed_section_contents): Move
        implementation to Object::decompressed_section_contents.
        (Sized_relobj_file::do_discard_decompressed_sections): Move
        implementation to Object::discard_decompressed_sections.
        * object.h (build_compressed_section_map): Declare.
        (Object::Object): Add compressed_sections_ field.
        (Object::section_is_compressed): Move implementation here.
        (Object::decompressed_section_contents): De-virtualize.
        (Object::discard_decompressed_sections): De-virtualize.
        (Object::do_section_is_compressed): Delete.
        (Object::do_decompressed_section_contents): Delete.
        (Object::set_compressed_sections): New method.
        (Object::compressed_sections): New method.
        (Object::compressed_sections_): New data member.
        (Compressed_section_info, Compressed_section_map): Move to top of file.
        (Sized_relobj_file::do_section_is_compressed): Delete.
        (Sized_relobj_file::do_decompressed_section_contents): Delete.
        (Sized_relobj_file::do_discard_decompressed_sections): Delete.
        (Sized_relobj_file::compressed_sections_): Move to Object class.
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