* libgcov.c (create_file_directory): New function. Create
	directory for the given file name.
	(gcov_max_filename): New static var. Keeps size of the longest
	file name.
	(gcov_exit): Always try to create directory for output
	file. Relocate each filename basing on environment vars.
	(__gcov_init): Remember the longest file name.
	* tsystem.h: include filenames.h to get IS_DIR_SEPARATOR
	* doc/gcov.texi (Cross-profiling): New node documenting
	cross-profiling management.
	* doc/invoke.texi (-fprofile-arcs): Add xref to cross-profiling.

From-SVN: r99523