* libgcov.c (gcov_crc32): Remove global var.
	(free_fn_data): New function.
	(buffer_fn_data): Pass in filename, more robust error recovery.
	(crc32_unsigned): New function.
	(gcov_exit): More robust detection of new program. More robust
	error recovery.
	(__gcov_init): Do not update program's crc here.

From-SVN: r182743