Remove empty class Merge_map.

Remove empty class Merge_map.

2015-03-02  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>

	* ehframe.cc (Cie::set_output_offset): Pass in and use a
	Output_section_data instead of a Merge_map.
	(Eh_frame::Eh_frame): Don't initialize merge_map_.
	(Eh_frame::read_cie): Use add_merge_mapping instead of
	Merge_map::add_mapping.
	(Eh_frame::read_fde): Ditto.
	(Eh_frame::set_final_data_size): Use this instead of this->merge_map_.
	(Eh_frame::do_output_offset): Use merge_output_offset istead of
	merge_map_->get_output_offset.
	(Eh_frame::do_is_merge_section_for): Delete.
	* ehframe.h (Fde::add_mapping): Pass in and use a Output_section_data
	instead of a Merge_map.
	(Cie::set_output_offset): Pass in a Output_section_data instead of a
	Merge_map.
	(Eh_frame::do_is_merge_section_for): Delete.
	(Eh_frame::merge_map_): Delete.
	* merge.cc (Object_merge_map::get_or_make_input_merge_map): Pass in
	and use a Output_section_data instead of a Merge_map.
	(Object_merge_map::add_mapping): Ditto.
	(Object_merge_map::get_output_offset): Remove the merge_map argument.
	(Object_merge_map::is_merge_section_for): Pass in and use a
	Output_section_data instead of a Merge_map.
	(Merge_map): Delete.
	(Output_merge_base::do_output_offset): Use merge_output_offset instead
	of merge_map_.get_output_offset.
	(Output_merge_base::do_is_merge_section_for): Delete.
	(Output_merge_data::do_add_input_section): Use
	object->add_merge_mapping instead of add_mapping.
	(Output_merge_string<Char_type>::finalize_merged_data): Ditto.
	* merge.h (Merge_map): Delete forward declaration.
	(Object_merge_map::add_mapping): Pass in and use a Output_section_data
	instead of a Merge_map.
	(Object_merge_map::get_output_offset): Remove the merge_map argument.
	(Object_merge_map::is_merge_section_for): Pass in and use a
	Output_section_data instead of a Merge_map.
	(Input_merge_map::Object_merge_map::merge_map): Replace with
	output_data.
	(Object_merge_map::get_or_make_input_merge_map): Pass in and use a
	Output_section_data instead of a Merge_map.
	(Merge_map): Delete.
	(Output_merge_base::Output_merge_base): Don't initialize merge_map_.
	(Output_merge_base::do_is_merge_section_for): Delete.
	(Output_merge_base::add_mapping): Delete.
	(Output_merge_base::merge_map_): Delete.
	* object.cc (Relobj::initialize_input_to_output_map): New.
	(Relobj::initialize_input_to_output_map): New.
	(Relobj::merge_output_offset): New.
	(Relobj::is_merge_section_for): New.
	(Relobj::initialize_input_to_output_map): Instantiate for 32 and 64
	bits.
	* object.h (Relobj::merge_map): Delete.
	(initialize_input_to_output_map): New.
	(set_merge_map): Delete.
	(add_merge_mapping): New.
	(merge_output_offset): New.
	(is_merge_section_for): New.
	* output.cc (Output_section::Input_section::is_merge_section_for):
	Use object->is_merge_section_for.
	* output.h (Output_section_data::is_merge_section_for): Delete.
	(Output_section_data::do_is_merge_section_for): Delete.
	* reloc.cc (Merged_symbol_value<size>::initialize_input_to_output_map):
	Use object->initialize_input_to_output_map.
	(Merged_symbol_value<size>::value_from_output_section): Use
	object->merge_output_offset.