elfcpp/:

elfcpp/:
	* elf_file.h: (class Elf_strtab): New class.
gold/:
	* gold.cc: (queue_initial_tasks): Pass incremental_inputs to
	Incremental_checker.
	* incremental.cc: (INCREMENTAL_LINK_VERSION): Change type to
	unsigned int.
	(class Incremental_inputs_header): New class.
	(Incremental_inputs_header_writer): Edit comment.
	(Incremental_inputs_entry): New class.
	(Incremental_inputs_entry_writer): Edit comment.
	(Sized_incremental_binary::do_find_incremental_inputs_section):
	Add *strtab_shndx parameter, fill it.
	(Sized_incremental_binary::do_check_inputs): New method.
	(Incremental_checker::can_incrementally_link_output_file): Use
	Sized_incremental_binary::check_inputs.
	(Incremental_inputs::report_command_line): Save command line in
	command_line_.
	* incremental.h:
	(Incremental_binary::find_incremental_inputs_section): New
	method.
	(Incremental_binary::do_find_incremental_inputs_section): Add
	strtab_shndx parameter.
	(Incremental_binary::do_check_inputs): New pure virtual method.
	(Sized_incremental_binary::do_check_inputs): Declare.
	(Incremental_checker::Incremental_checker): Add incremental_inputs
	parameter, use it to initialize incremental_inputs_.
	(Incremental_checker::incremental_inputs_): New field.
	(Incremental_checker::command_line): New method.
	(Incremental_checker::inputs): New method.
	(Incremental_checker::command_line_): New field.