PR other/63504
	* combine.c (reg_n_sets_max): New variable.
	(can_change_dest_mode, reg_nonzero_bits_for_combine,
	reg_num_sign_bit_copies_for_combine, get_last_value_validate,
	get_last_value): Use REG_N_SETS only on pseudos < reg_n_sets_max.
	(try_combine): Use INC_REG_N_SETS only on pseudos < reg_n_sets_max.
	(rest_of_handle_combine): Initialize reg_n_sets_max.

From-SVN: r220368