GCOV: std::vector refactoring.

GCOV: std::vector refactoring.

2017-10-31  Martin Liska  <mliska@suse.cz>

	* gcov.c (struct source_info): Remove typedef.
	(source_info::source_info): Add proper ctor.
	(accumulate_line_counts): Use struct, not it's typedef.
	(output_gcov_file): Likewise.
	(output_lines): Likewise.
	(main): Do not allocate an array.
	(output_intermediate_file): Use size of vector container.
	(process_file): Resize the vector.
	(generate_results): Do not preallocate, use newly added vector
	lines.
	(release_structures): Do not release sources.
	(find_source): Use vector methods.
	(add_line_counts): Do not use typedef.

From-SVN: r254260