combine.c (force_to_mode): Only replace with (not Y) if all bits in fuller_mask (not just mask) are set in C.

	* combine.c (force_to_mode): Only replace with (not Y) if all bits in fuller_mask
	(not just mask) are set in C.

	* gcc.c-torture/execute/20021118-3.c: New test.

From-SVN: r59295