* common.cc (Symbol_table::do_allocate_commons_list): Call

	* common.cc (Symbol_table::do_allocate_commons_list): Call
	gold_fallback.
	* errors.cc (Errors::fatal): Adjust call to gold_exit.
	(Errors::fallback): New function.
	(gold_fallback): New function.
	* errors.h (Errors::fallback): New function.
	* gold.cc (gold_exit): Change status parameter to enum; adjust
	all callers.
	(queue_initial_tasks): Call gold_fallback.
	* gold.h: Include cstdlib.
	(Exit_status): New enum type.
	(gold_exit): Change status parameter to enum.
	(gold_fallback): New function.
	* layout.cc (Layout::set_section_offsets): Call gold_fallback.
	(Layout::create_symtab_sections): Likewise.
	(Layout::create_shdrs): Likewise.
	* main.cc (main): Adjust call to gold_exit.
	* output.cc (Output_data_got::add_got_entry): Call gold_fallback.
	(Output_data_got::add_got_entry_pair): Likewise.
	(Output_section::add_input_section): Likewise.
	(Output_section::add_output_section_data): Likewise.
	(Output_segment::set_section_list_addresses): Likewise.
	* x86_64.cc (Output_data_plt_x86_64::add_entry): Likewise.