GCOV: remove typedef for arc_t

GCOV: remove typedef for arc_t

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

	* gcov.c (struct arc_info): Remove typedef for arc_t.
	(struct line_info): Likewise.
	(add_branch_counts): Likewise.
	(output_branch_count): Likewise.
	(function_info::~function_info): Likewise.
	(circuit): Likewise.
	(output_intermediate_line): Likewise.
	(read_graph_file): Likewise.
	(solve_flow_graph): Likewise.
	(find_exception_blocks): Likewise.
	(add_line_counts): Likewise.
	(accumulate_line_info): Likewise.
	(output_line_details): Likewise.
	(output_function_details): Likewise.

From-SVN: r254676