* genattrtab.c (simplify_cond): Update indices correctly.
	(attr_alt_subset_p, attr_alt_subset_of_compl_p, attr_alt_intersection,
	attr_alt_union, attr_alt_complement, attr_alt_bit_p, mk_attr_alt): New.
	(check_attr_test, encode_units_mask, compute_alternative_mask,
	make_alternative_compare, simplify_and_tree,
	attr_rtx_cost, simplify_test_exp, gen_attr,
	write_test_expr, walk_attr_value): Handle EQ_ATTR_ALT.
	* rtl.def (EQ_ATTR_ALT): New.

From-SVN: r73873