GCOV: add support for lines with an unexecuted lines.

GCOV: add support for lines with an unexecuted lines.

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

	* doc/gcov.texi: Document that.
	* gcov.c (add_line_counts): Mark lines with a non-executed
	statement.
	(output_line_beginning): Handle such lines.
	(output_lines): Pass new argument.
	(output_intermediate_file): Print it in intermediate format.
2017-10-31  Martin Liska  <mliska@suse.cz>

	* g++.dg/gcov/ternary.C: New test.
	* g++.dg/gcov/gcov-threads-1.C (main): Update expected line
	count.
	* lib/gcov.exp: Support new format for intermediate file format.

From-SVN: r254259