gcov.c (struct name_map): New.

gcov.c (struct name_map): New.

	* gcov.c (struct name_map): New.
	(names, n_names, a_names): New global vars.
	(print_usage): Adjust usage.
	(generate_results): Canonicalize main file name.
	(release_structures): Adjust.
	(name_search, name_sort): New callbacks.
	(find_source): Look for and create a canonical name.
	(canonicalize_name): New.
	(make_gcov_file_name): Reimplement and fix mangling.
	(mangle_name): New.
	* doc/gcov.texi: Update documentation about path preservation.

	testsuite/
	* gcc.misc-tests/gcov-15.c: New.

From-SVN: r181309