gcov.c: Add -a & -u options.

gcov.c: Add -a & -u options.

	* gcov.c: Add -a & -u options.
	(struct arc_info): Add local_span, is_call_non_return,
	is_nonlocal_return, is_unconditional flags, remove is_call flag.
	(struct block_info): Add flags, is_call_site, is_nonlocal_return
	members. Make encodings a union with span member.
	(struct function_info): Add blocks_executed, line, src, line_next
	members.
	(struct coverage_info): Make branches a union with blocks member.
	(struct source_info): Add functions member.
	(object_summary, program_count): New global variables.
	(flag_all_blocks, flag_unconditional): New flags.
	(find_source, output_branch_count): New functions.
	(print_usage): Adjust.
	(options): Adjust.
	(process_args): Adjust.
	(read_graph_file) <GCOV_TAG_FUNCTION>: Adjust.
	<GCOV_TAG_BLOCKS>: Read flags.
	<GCOV_TAG_LINES>: Adjust.
	(read_count_file): Process SUMMARY tags.
	(solve_flow_graph): Set is_unconditional and clear is_call_site
	appropriately.
	(add_branch_counts): Adjust. Don't count unconditional branches.
	(add_line_counts): Deal with all-blocks mode, accumulate block
	coverage.
	(accumulate_line_counts): Adjust, generate local spanning tree for
	all-blocks mode.
	(output_lines): Adjust.
	* profile.c (branch_prob): Alter GCOV_FUNCTION_TAG record.
	* doc/gcov.texi: Document.
testsuite:
	* lib/gcov.exp: Adjust call return testing strings.
	* g77.dg/gcov/gcov-1.f: Don't expect unconditional branches.

From-SVN: r65090