GCOV: remove typedef for function_t

GCOV: remove typedef for function_t

2017-11-13  Martin Liska  <mliska@suse.cz>

	* gcov.c (struct function_info): Remove typedef for function_t.
	(struct source_info): Likewise.
	(source_info::get_functions_at_location): Likewise.
	(solve_flow_graph): Likewise.
	(find_exception_blocks): Likewise.
	(add_line_counts): Likewise.
	(output_intermediate_file): Likewise.
	(process_file): Likewise.
	(generate_results): Likewise.
	(release_structures): Likewise.
	(read_graph_file): Likewise.
	(read_count_file): Likewise.
	(accumulate_line_counts): Likewise.
	(output_lines): Likewise.

From-SVN: r254675